Просмотр кода страницы Английская Википедия:Holocene extinction

{{Английская Википедия/Панель перехода}}
{{Short description|Ongoing extinction event caused by human activity}}
{{Redirect|Sixth Extinction}}
[[File:Pioneers in South Africa (1914) (14576727409).jpg|thumb|The [[dodo]] became [[extinction|extinct]] during the mid-to-late [[17th century]] due to habitat destruction, overhunting, and predation by introduced mammals.<ref>{{cite book|last1=Hume|first1=J. P.|author-link=Julian P. Hume|last2=Walters|first2=M.|year=2012|title=Extinct Birds|location=London|publisher=A & C Black|isbn=978-1-4081-5725-1}}</ref> It is an often-cited example of a modern extinction.<ref name="Diamond">{{cite book|last=Diamond|first=Jared|author-link=Jared Diamond|title=Guns, Germs, and Steel|publisher=W.W. Norton|year=1999|isbn=978-0-393-31755-8|pages=[https://archive.org/details/gunsgermssteelfa00diam/page/43 43–44]|chapter=Up to the Starting Line|title-link=Guns, Germs, and Steel}}</ref>]]

The '''Holocene extinction''', or '''Anthropocene extinction''',<ref>{{cite journal|last1=Wagler|first1=Ron|date=2011|title=The Anthropocene Mass Extinction: An Emerging Curriculum Theme for Science Educators |url=https://online.ucpress.edu/abt/article/73/2/78/18301/The-Anthropocene-Mass-Extinction-An-Emerging |journal=The American Biology Teacher|volume=73|issue=2|pages=78–83 |doi=10.1525/abt.2011.73.2.5 |s2cid=86352610|access-date=}}</ref><ref>{{cite news|last=Walsh|first=Alistair|date=January 11, 2022|title=What to expect from the world's sixth mass extinction|url=https://www.dw.com/en/what-to-expect-from-the-worlds-sixth-mass-extinction/a-60360245|work=[[Deutsche Welle]]|location=|access-date=February 5, 2022}}</ref> is the ongoing [[extinction event]] caused by humans during the [[Holocene]] epoch. These [[extinction]]s span numerous families of [[plant]]s<ref>{{cite news |last=Hollingsworth |first=Julia |date=June 11, 2019 |title=Almost 600 plant species have become extinct in the last 250 years |work=CNN |url=https://www.cnn.com/2019/06/11/asia/plant-extinctions-science-intl-hnk/ |access-date=January 14, 2020 |quote="The research -- published Monday in Nature, Ecology & Evolution journal -- found that 571 plant species have disappeared from the wild worldwide, and that plant extinction is occurring up to 500 times faster than the rate it would without human intervention."}}</ref><ref>{{cite news |last=Guy |first=Jack |date=September 30, 2020 |title=Around 40% of the world's plant species are threatened with extinction |work=CNN |location= |url=https://www.cnn.com/2020/09/30/world/kew-gardens-plants-report-scli-intl-gbr-scn/index.html |access-date=September 1, 2021}}</ref><ref>{{cite news |last=Watts |first=Jonathan |date=August 31, 2021 |title=Up to half of world's wild tree species could be at risk of extinction |work=[[The Guardian]] |url=https://www.theguardian.com/environment/2021/sep/01/up-to-half-worlds-wild-tree-species-could-risk-extinction |access-date=September 1, 2021}}</ref> and [[animal]]s, including [[mammal]]s, [[bird]]s, [[reptile]]s, [[amphibian]]s, [[fish]], and [[invertebrate]]s, and affecting not just terrestrial species but also large sectors of [[marine life]].<ref>Marine Extinctions: Patterns and Processes - an overview. 2013. ''CIESM Monograph 45'' [https://www.researchgate.net/publication/271767063]</ref> With widespread degradation of [[biodiversity hotspot]]s, such as [[coral reef]]s and [[rainforest]]s, as well as other areas, the vast majority of these extinctions are thought to be undocumented, as the species are undiscovered at the time of their extinction, which goes unrecorded. The current rate of extinction of species is estimated at 100 to 1,000 times higher than natural [[background extinction rate]]s<ref name="Ceballos-Ehrlich-2018-06">{{cite journal |last1=Ceballos |first1=Gerardo |last2=Ehrlich |first2=Paul R. |author-link2=Paul R. Ehrlich |date=8 June 2018 |title=The misunderstood sixth mass extinction |journal=[[Science (journal)|Science]] |volume=360 |issue=6393 |pages=1080–1081 |bibcode=2018Sci...360.1080C |doi=10.1126/science.aau0191 |oclc=7673137938 |pmid=29880679 |s2cid=46984172}}</ref><ref name="PimmJenkins" /><ref name="Pimm-1995" /><ref name="Teyssèdre-2004">{{Cite book |last=Teyssèdre |first=Anne |url=https://www.worldcat.org/oclc/57892208 |title=Toward a sixth mass extinction crisis? Chapter 2 in Biodiversity & global change : social issues and scientific challenges |date=2004 |publisher=Adpf |others=R. Barbault, Bernard Chevassus-au-Louis, Anne Teyssèdre, Association pour la diffusion de la pensée française |isbn=2-914935-28-5 |location=Paris |pages=24–49 |oclc=57892208}}</ref><ref name="De Vos">{{Cite journal |last1=De Vos |first1=Jurriaan M. |last2=Joppa |first2=Lucas N. |last3=Gittleman |first3=John L. |last4=Stephens |first4=Patrick R. |last5=Pimm |first5=Stuart L. |date=2014-08-26 |title=Estimating the normal background rate of species extinction |url=https://www.zora.uzh.ch/id/eprint/98443/1/Conservation_Biology_2014_early-view.pdf |journal=Conservation Biology |language=es |volume=29 |issue=2 |pages=452–462 |doi=10.1111/cobi.12380 |issn=0888-8892 |pmid=25159086 |s2cid=19121609}}</ref> and is increasing.<ref name="ceballos">{{cite journal |last1=Ceballos |first1=Gerardo |last2=Ehrlich |first2=Paul R. |last3=Barnosky |first3=Anthony D. |last4=García |first4=Andrés |last5=Pringle |first5=Robert M. |last6=Palmer |first6=Todd M. |date=19 June 2015 |title=Accelerated modern human-induced species losses: Entering the sixth mass extinction |journal=[[Science Advances]] |volume=1 |issue=5 |page=e1400253 |bibcode=2015SciA....1E0253C |doi=10.1126/sciadv.1400253 |pmc=4640606 |pmid=26601195 |quote=All of these are related to human population size and growth, which increases consumption (especially among the rich), and economic inequity.}}</ref> During the past 100–200 years, biodiversity loss and species extinction have accelerated,<ref name="PimmJenkins">{{cite journal|vauthors=Pimm SL, Jenkins CN, Abell R, Brooks TM, Gittleman JL, Joppa LN, Raven PH, Roberts CM, Sexton JO |date=30 May 2014|title=The biodiversity of species and their rates of extinction, distribution, and protection|journal=Science|volume=344 |issue=6187|pages=1246752-1–1246752-10|pmid=24876501|s2cid=206552746 |doi=10.1126/science.1246752|quote=The overarching driver of species extinction is human population growth and increasing per capita consumption. |url=http://static.squarespace.com/static/51b078a6e4b0e8d244dd9620/t/538797c3e4b07a163543ea0f/1401395139381/Pimm+et+al.+2014.pdf}}</ref> to the point that most [[conservation biologists]] now believe that [[humankind|human]] activity has either produced a period of mass extinction,<ref>{{Cite news |last=World Wildlife Fund |date=September 10, 2020 |title=Bending the curve of biodiversity loss |work=Living Planet Report 2020 |url=https://www.worldwildlife.org/publications/living-planet-report-2020 |access-date=}}</ref><ref>{{Cite journal|last1=Raven|first1=Peter H.|last2=Chase|first2=Jonathan M.|last3=Pires|first3=J. Chris |date=2011 |title=Introduction to special issue on biodiversity |doi=10.3732/ajb.1100055 |journal=American Journal of Botany |volume=98 |issue=3 |pages=333–335 |pmid=21613129 |url=https://bsapubs.onlinelibrary.wiley.com/doi/epdf/10.3732/ajb.1100055}}</ref> or is on the cusp of doing so.<ref>{{Cite journal |vauthors=Rosenberg KV, Dokter AM, Blancher PJ, Sauer JR, Smith AC, Smith PA, Stanton JC, Panjabi A, Helft L, Parr M, Marra PP |date=2019 |title=Decline of the North American avifauna |journal=Science |volume=366 |issue=6461 |pages=120–124 |doi=10.1126/science.aaw1313 |pmid=31604313|bibcode=2019Sci...366..120R |s2cid=203719982 |doi-access=free }}</ref><ref name="Barnosky2011">{{cite journal |last=Barnosky |first=Anthony D. |author-link1=Anthony David Barnosky |author2=Matzke, Nicholas |author3=Tomiya, Susumu |author4=Wogan, Guinevere O. U. |author5=Swartz, Brian |author6=Quental, Tiago B. |author7=Marshall, Charles |author8=McGuire, Jenny L. |author9=Lindsey, Emily L. |author10=Maguire, Kaitlin C. |author11=Mersey, Ben |author12=Ferrer, Elizabeth A. |date=3 March 2011 |title=Has the Earth's sixth mass extinction already arrived? |journal=[[Nature (journal)|Nature]] |volume=471 |issue=7336 |pages=51–57 |doi=10.1038/nature09678 |pmid=21368823 |s2cid=4424650 |bibcode=2011Natur.471...51B}}</ref> As such, after the [[Extinction event#The "Big Five" mass extinctions|"Big Five" mass extinctions]], the Holocene extinction event has also been referred to as the '''sixth mass extinction''' or '''sixth extinction''';<ref>{{Cite journal |last=Briggs |first=John C |date=October 2017 |title=Emergence of a sixth mass extinction? |url=http://academic.oup.com/biolinnean/article/122/2/243/3869095/Emergence-of-a-sixth-mass-extinction |journal=Biological Journal of the Linnean Society |language=en |volume=122 |issue=2 |pages=243–248 |doi=10.1093/biolinnean/blx063 |issn=0024-4066|doi-access=free }}</ref><ref name="Cowie"/><ref name="Strona"/> given the recent recognition of the [[Capitanian mass extinction event|Capitanian mass extinction]], the term '''seventh mass extinction''' has also been proposed for the Holocene extinction event.<ref name="Rampino-2019">{{cite journal |last1=Rampino |first1=Michael R. |last2=Shen |first2=Shu-Zhong |date=5 September 2019 |title=The end-Guadalupian (259.8 Ma) biodiversity crisis: the sixth major mass extinction? |url=https://www.tandfonline.com/doi/full/10.1080/08912963.2019.1658096 |journal=[[Historical Biology]] |volume=33 |issue=5 |pages=716–722 |doi=10.1080/08912963.2019.1658096 |access-date=7 January 2023 |s2cid=202858078}}</ref><ref name="Newsweek-2019">{{cite web|url=https://www.newsweek.com/seventh-mass-extinction-severe-deadly-event-1458474|title=Seventh Mass Extinction? Severe and Deadly Event 260 Million Years Ago Discovered by Scientists|website=[[Newsweek]] |date=9 October 2019}}</ref>

The Holocene extinction follows [[Late Pleistocene extinctions|the extinction of many large (megafaunal) animals during the preceding Late Pleistocene]]. Some of these extinctions were likely in part due to human hunting pressure.<ref>{{cite web |url=https://www.eurekalert.org/pub_releases/2015-08/au-wht082015.php|title=Without humans, the whole world could look like Serengeti|website=EurekAlert!|access-date=August 16, 2020|quote=The existence of Africa's many species of mammals is thus not due to an optimal climate and environment, but rather because it is the only place where they have not yet been eradicated by humans. The underlying reason includes evolutionary adaptation of large mammals to humans as well as greater pest pressure on human populations in long-inhabited Africa in the past.}}</ref><ref name="Faurby2015">{{cite journal|last1=Faurby|first1=Søren|last2=Svenning|first2=Jens-Christian |date=2015|title=Historic and prehistoric human-driven extinctions have reshaped global mammal diversity patterns|journal=[[Diversity and Distributions]]|volume=21|issue=10|pages=1155–1166 |doi=10.1111/ddi.12369|bibcode=2015DivDi..21.1155F |hdl-access=free|hdl=10261/123512|s2cid=196689979}}</ref> The most popular theory is that human [[overhunting]] of species added to existing stress conditions as the Holocene extinction coincides with [[Early human migrations|human colonization]] of many new areas around the world. Although there is debate regarding how much human [[predation]] and [[habitat loss]] affected their decline, certain population declines have been directly correlated with the onset of human activity, such as the extinction events of [[List of extinct animals of New Zealand|New Zealand]], Madagascar, and [[List of extinct animals of the Hawaiian Islands|Hawaii]]. Aside from humans, [[Climate variability and change|climate change]] may have been a driving factor in the megafaunal extinctions, especially at the end of the [[Pleistocene]].

Over the course of the Late Holocene, there were hundreds of extinctions of birds on islands across the Pacific, driven by human settlement of the previously uninhabited islands, with extinctions peaking around 1300 AD.<ref>{{Cite journal |last1=Cooke |first1=Rob |last2=Sayol |first2=Ferran |last3=Andermann |first3=Tobias |last4=Blackburn |first4=Tim M. |last5=Steinbauer |first5=Manuel J. |last6=Antonelli |first6=Alexandre |last7=Faurby |first7=Søren |date=2023-12-19 |title=Undiscovered bird extinctions obscure the true magnitude of human-driven extinction waves |journal=Nature Communications |language=en |volume=14 |issue=1 |page=8116 |doi=10.1038/s41467-023-43445-2 |issn=2041-1723 |pmc=10730700 |pmid=38114469|bibcode=2023NatCo..14.8116C }}</ref> Roughly 12% of avian species have been driven to extinction by human activity over the last 126,000 years, which is double previous estimates.<ref>{{cite news |last=Gemma |first=Conroy|date=December 19, 2023 |title=Humans might have driven 1,500 bird species to extinction — twice previous estimates|url=https://www.nature.com/articles/d41586-023-04065-4|work=[[Nature (journal)|Nature]] |location= |access-date=January 16, 2024}}</ref>

In the [[twentieth century]], human numbers quadrupled, and the size of the global economy increased twenty-five-fold.<ref>{{Cite book |last1=McNeill |first1=John Robert |last2=Engelke |first2=Peter |title=The Great Acceleration: An Environmental History of the Anthropocene since 1945 |publisher=Harvard University Press |year=2016 |isbn=978-0674545038 |edition=1st}}</ref><ref>{{Cite book |last1=Daly |first1=Herman E. |last2=Farley |first2=Joshua C. |title=Ecological economics, second edition: Principles and applications |publisher=Island Press |year=2010 |isbn=9781597266819}}</ref> This [[Great Acceleration]] or [[Anthropocene]] epoch has also accelerated species extinction.<ref>{{Cite news |last=IPBES |date=2019 |title=Summary for policymakers of the global assessment report on biodiversity and ecosystem services of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) |publisher=IPBES Secretariat |place=Bonn, Germany |url=https://ipbes.net/sites/default/files/inline/files/ipbes_global_assessment_report_summary_for_policymakers.pdf}}</ref><ref name="Crist2021">{{Cite journal |vauthors=Crist E, Kopnina H, Cafaro P, Gray J, Ripple WJ, Safina C, Davis J, DellaSala DA, Noss RF, Washington H, Rolston III H, Taylor B, Orlikowska EH, Heister A, Lynn WS, Piccolo JJ |date=18 November 2021 |title=Protecting half the planet and transforming human systems are complementary goals |journal=Frontiers in Conservation Science |volume=2 |at=761292 |doi=10.3389/fcosc.2021.761292|doi-access=free}}</ref> [[Ecologically]], humanity is now an unprecedented "global superpredator",<ref name="Darimont-2015">{{Cite journal|last1=Darimont|first1=Chris T.|last2=Fox |first2=Caroline H.|last3=Bryan|first3=Heather M.|last4=Reimchen |first4=Thomas E.|date=21 August 2015 |title=The unique ecology of human predators|journal=Science|volume=349|issue=6250|pages=858–860 |issn=0036-8075|bibcode=2015Sci...349..858D|doi=10.1126/science.aac4249 |pmid=26293961 |s2cid=4985359}}</ref> which consistently preys on the adults of other [[apex predator]]s, takes over other species' essential habitats and displaces them,<ref name="Cafaro2022">{{Cite journal |last1=Cafaro |first1=Philip |last2=Hansson |first2=Pernilla |last3=Götmark |first3=Frank |date=August 2022 |title=Overpopulation is a major cause of biodiversity loss and smaller human populations are necessary to preserve what is left |journal=[[Biological Conservation (journal)|Biological Conservation]] |volume=272 |at=109646 |issn=0006-3207 |doi=10.1016/j.biocon.2022.109646|bibcode=2022BCons.27209646C |s2cid=250185617|url=https://www.sustainable.soltechdesigns.com/Overpopulation-and-biodiversty-loss(2022).pdf}}</ref> and has [[human impact on the environment|worldwide effect]]s on [[food web]]s.<ref>{{cite journal |last1=Fricke|first1=Evan C. |last2=Hsieh |first2=Chia |last3=Middleton |first3=Owen |last4=Gorczynski |first4=Daniel |last5=Cappello |first5=Caroline D. |last6=Sanisidro |first6=Oscar |last7=Rowan |first7=John |last8=Svenning |first8=Jens-Christian |last9=Beaudrot |first9=Lydia |date=August 25, 2022 |title=Collapse of terrestrial mammal food webs since the Late Pleistocene |journal=Science |volume=377 |issue=6609 |pages=1008–1011 |doi=10.1126/science.abn4012 |pmid=36007038 |bibcode=2022Sci...377.1008F |s2cid=251843290 |quote=Food webs underwent steep regional declines in complexity through loss of food web links after the arrival and expansion of human populations. We estimate that [[defaunation]] has caused a 53% decline in food web links globally.}}</ref> There are many famous examples of extinctions [[List of African animals extinct in the Holocene|within Africa]], [[List of Asian animals extinct in the Holocene|Asia]], [[List of extinct animals of Europe|Europe]], [[List of extinct animals of Australia|Australia]], [[List of North American animals extinct in the Holocene|North]] and [[List of South American animals extinct in the Holocene|South America]], and on smaller islands.

Overall, the Holocene extinction can be linked to the [[human impact on the environment]]. The Holocene extinction continues into the 21st century, with [[human population growth]],<ref>{{cite journal |last1=Dasgupta |first1=Partha S. |last2=Ehrlich |first2=Paul R. |date=19 April 2013 |title=Pervasive Externalities at the Population, Consumption, and Environment Nexus |url=https://www.science.org/doi/10.1126/science.1224664 |journal=[[Science (journal)|Science]] |volume=340 |issue=6130 |pages=324–328 |doi=10.1126/science.1224664 |pmid=23599486 |bibcode=2013Sci...340..324D |s2cid=9503728 |access-date=3 January 2023}}</ref><ref>{{cite journal |last1=Cincotta |first1=Richard P. |last2=Engelman |first2=Robert |date=Spring 2000 |title=Biodiversity and population growth |url=https://go.gale.com/ps/i.do?id=GALE%7CA71961995&sid=googleScholar&v=2.1&it=r&linkaccess=abs&issn=07485492&p=AONE&sw=w&userGroupName=anon%7Edcde5366 |journal=[[Issues in Science and Technology]] |volume=16 |issue=3 |pages=80 |access-date=3 January 2023}}</ref><ref>{{cite journal |last1=Maurer |first1=Brian A. |date=January 1996 |title=Relating Human Population Growth to the Loss of Biodiversity |url=https://www.jstor.org/stable/2999702 |journal=[[Biodiversity Letters]] |volume=3 |issue=1 |pages=1–5 |doi=10.2307/2999702 |jstor=2999702 |access-date=3 January 2023}}</ref><ref>{{cite news|last= Cockburn|first=Harry|date=March 29, 2019|title=Population explosion fuelling rapid reduction of wildlife on African savannah, study shows |url=https://www.independent.co.uk/environment/wildlife-africa-savanah-serengeti-masai-mara-population-a8843936.html|work=[[The Independent]]|access-date=April 1, 2019|quote=Encroachment by people into one of Africa’s most celebrated ecosystems is "squeezing the wildlife in its core", by damaging habitation and disrupting the migration routes of animals, a major international study has concluded.}}</ref> [[overconsumption|increasing per capita consumption]]<ref name="PimmJenkins"/><ref name="Stokstad">{{Cite web|url=https://www.science.org/content/article/landmark-analysis-documents-alarming-global-decline-nature|title=Landmark analysis documents the alarming global decline of nature |last=Stokstad|first=Erik|date=5 May 2019 |website=[[Science (journal)|Science]]|publisher=[[American Association for the Advancement of Science|AAAS]]|access-date=26 August 2020|quote=For the first time at a global scale, the report has ranked the causes of damage. Topping the list, changes in land use—principally agriculture—that have destroyed habitat. Second, hunting and other kinds of exploitation. These are followed by climate change, pollution, and invasive species, which are being spread by trade and other activities. Climate change will likely overtake the other threats in the next decades, the authors note. Driving these threats are the growing human population, which has doubled since 1970 to 7.6 billion, and consumption. (Per capita of use of materials is up 15% over the past 5 decades.)}}</ref> (especially by the super-[[Wealth|affluent]]),<ref name=Ceballos-Ehrlich-2017-05/><ref name= affluent>{{cite journal |last1=Wiedmann|first1=Thomas |last2=Lenzen|first2=Manfred |last3=Keyßer|first3=Lorenz T. |last4=Steinberger|first4=Julia K.|author-link4=Julia Steinberger|title=Scientists' warning on affluence |journal=[[Nature Communications]] |date=2020 |volume=11 |issue=3107 |page=3107 |doi=10.1038/s41467-020-16941-y |pmid=32561753 |pmc=7305220 |bibcode=2020NatCo..11.3107W|quote=The affluent citizens of the world are responsible for most environmental impacts and are central to any future prospect of retreating to safer environmental conditions . . . It is clear that prevailing capitalist, growth-driven economic systems have not only increased affluence since World War II, but have led to enormous increases in inequality, financial instability, resource consumption and environmental pressures on vital earth support systems.}}</ref><ref>{{cite news |last=Greenfield|first=Patrick |date=March 2, 2023 |title=Overconsumption by the rich must be tackled, says acting UN biodiversity chief|url=https://www.theguardian.com/environment/2023/mar/02/overconsumption-by-rich-must-be-tackled-says-acting-un-biodiversity-chief-aoe|work=The Guardian |location= |access-date=March 2, 2023}}</ref> and [[Environmental impact of meat production|meat production and consumption]],<ref name="WorldScientists"/><ref name="BBCIPBES2019" /><ref name="Plant-based">{{cite news|last=Carrington|first=Damian|date=February 3, 2021|title=Plant-based diets crucial to saving global wildlife, says report |url=https://www.theguardian.com/environment/2021/feb/03/plant-based-diets-crucial-to-saving-global-wildlife-says-report|work=The Guardian|access-date=August 5, 2021}}</ref><ref name="Machovina"/><ref name="Smithers"/><ref>{{cite journal|last=Boscardin|first=Livia|date=12 July 2016 |url=https://isaconf.confex.com/isaconf/forum2016/webprogram/Paper78184.html|title=Greenwashing the Animal-Industrial Complex: Sustainable Intensification and Happy Meat |website=3rd ISA Forum of Sociology, Vienna, Austria |publisher=ISAConf.confex.com|access-date=10 August 2021|quote=}}</ref> among others, being the primary drivers of mass extinction. [[Deforestation]],<ref name="WorldScientists" /> [[overfishing]], [[ocean acidification]], the destruction of [[wetlands]],<ref>{{cite news|last=Elbein |first=Saul|date=December 11, 2021|title=Wetlands point to extinction problems beyond climate change |url=https://thehill.com/policy/equilibrium-sustainability/585382-wetlands-point-to-extinction-problems-beyond-climate-change|work=[[The Hill (newspaper)|The Hill]]|location=|access-date=December 12, 2021}}</ref> and the [[decline in amphibian populations]],<ref name="Wake2008">{{Cite journal |last1=Wake |first1=David B.|last2=Vredenburg|first2=Vance T.|date=2008-08-12|title=Are we in the midst of the sixth mass extinction? A view from the world of amphibians|journal=Proceedings of the National Academy of Sciences |volume=105|issue=Suppl 1|pages=11466–11473|doi=10.1073/pnas.0801921105|issn=0027-8424 |pmid=18695221|doi-access=free|bibcode=2008PNAS..10511466W|pmc=2556420|quote="The possibility that a sixth mass extinction spasm is upon us has received much attention. Substantial evidence suggests that an extinction event is underway."}}</ref> among others, are a few broader examples of global [[biodiversity loss]].

== Background ==
{{annotated image/Extinction|float=right|caption=The percentage of marine animal extinction at the [[genus]] level through the five [[mass extinction]]s}}
[[Extinction event|Mass extinctions]] are characterized by the loss of at least 75% of [[species]] within a geologically short period of time (i.e., less than 2 million years).<ref name="Barnosky2011"/><ref>{{cite book |last=Wilson |first=Edward O. |title=The Future of life |publisher=Vintage Books |year=2003 |isbn=9780679768111 |edition=1st Vintage Books |location=New York |author-link=Edward O. Wilson}}</ref> The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinction event, after the [[Ordovician–Silurian extinction events]], the [[Late Devonian extinction]], the [[Permian–Triassic extinction event]], the [[Triassic–Jurassic extinction event]], and the [[Cretaceous–Paleogene extinction event]].<ref name="WorldScientists" /><ref name="dirzo">{{cite journal |last1=Dirzo |first1=Rodolfo |author-link1=Rodolfo Dirzo |last2=Young |first2=Hillary S. |last3=Galetti |first3=Mauro |last4=Ceballos |first4=Gerardo |last5=Isaac |first5=Nick J. B. |last6=Collen |first6=Ben |date=2014 |title=Defaunation in the Anthropocene |url=http://www.uv.mx/personal/tcarmona/files/2010/08/Science-2014-Dirzo-401-6-2.pdf |journal=Science |volume=345 |issue=6195 |pages=401–406 |bibcode=2014Sci...345..401D |doi=10.1126/science.1251817 |pmid=25061202 |quote=In the past 500 years, humans have triggered a wave of extinction, threat, and local population declines that may be comparable in both rate and magnitude with the five previous mass extinctions of Earth’s history |s2cid=206555761}}</ref><ref name=ceballos/><ref name="Ceballos-Ehrlich-2017-05" /><ref name="Kolbert-2014" /><ref name="Zalasiewicz2015">{{cite journal |last1=Williams |first1=Mark |last2=Zalasiewicz |first2=Jan |last3=Haff |first3=P. K. |last4=Schwägerl |first4=Christian |last5=Barnosky |first5=Anthony D. |last6=Ellis |first6=Erle C. |year=2015 |title=The Anthropocene Biosphere |journal=The Anthropocene Review |volume=2 |issue=3 |pages=196–219 |doi=10.1177/2053019615591020 |bibcode=2015AntRv...2..196W |s2cid=7771527}}</ref> If the [[Capitanian mass extinction event|Capitanian extinction event]] is included among the first-order mass extinctions, the Holocene extinction would correspondingly be known as the "seventh extinction".<ref name="Rampino-2019" /><ref name="Newsweek-2019" /> The [[Holocene]] is the current geological [[Geologic time scale|epoch]].

==Overview==
[[File:Moa mock hunt.jpg|thumb|The [[moa]] went extinct in New Zealand in the 1400s due to overhunting. Prior to the arrival of the [[Māori people|Maori]] a hundred years earlier, New Zealand was uninhabited by humans.]]

There is no general agreement on where the [[Holocene]], or [[Human impact on the environment|anthropogenic]], extinction begins, and the [[Quaternary extinction event]], which includes climate change resulting in the end of the [[Last Glacial Period|last ice age]], ends, or if they should be considered separate events at all.<ref name="Doughty, C. E. 2010">{{cite journal |last1=Doughty |first1=C. E. |last2=Wolf |first2=A. |last3=Field |first3=C. B. |year=2010 |title=Biophysical feedbacks between the Pleistocene megafauna extinction and climate: The first human-induced global warming? |journal=Geophysical Research Letters |volume=37 |issue=15 |pages=n/a |bibcode=2010GeoRL..3715703D |doi=10.1029/2010GL043985 |s2cid=54849882 |doi-access=free}}</ref><ref name="link.springer.com">{{cite journal|last1=Grayson|first1 =Donald K.|last2=Meltzer|first2=David J.|title=Clovis Hunting and Large Mammal Extinction: A Critical Review of the Evidence|journal=Journal of World Prehistory|date=December 2012|volume=16|issue=4|pages=313–359|doi=10.1023/A:1022912030020|s2cid =162794300}}</ref> The Holocene extinction is mainly caused by human activities.<ref name="dirzo" /><ref name="PimmJenkins" /><ref name="Zalasiewicz2015" /><ref name="SpecialIssue">{{Cite journal |last=Vignieri |first=S. |date=25 July 2014 |title=Vanishing fauna (Special issue) |journal=Science |volume=345 |issue=6195 |pages=392–412 |bibcode=2014Sci...345..392V |doi=10.1126/science.345.6195.392 |pmid=25061199 |doi-access=free}}</ref> Some have suggested that anthropogenic extinctions may have begun as early as when the first modern humans spread out of Africa between 200,000 and 100,000 years ago; this is supported by rapid megafaunal extinction following recent human colonization in [[Australian megafauna|Australia]], [[List of extinct animals of New Zealand|New Zealand]], and [[List of African animals extinct in the Holocene|Madagascar]].<ref name="Kolbert-2014">{{Cite book|last=Kolbert|first=Elizabeth|author-link=Elizabeth Kolbert|title=The Sixth Extinction: An Unnatural History|title-link=The Sixth Extinction: An Unnatural History|year=2014|publisher=[[Henry Holt and Company]]|location=New York City|isbn=978-0805092998}}</ref> In many cases, it is suggested that even minimal hunting pressure was enough to wipe out large fauna, particularly on [[Geographical isolation|geographically isolated]] islands.<ref name="Perry-2014">{{Cite journal|last1=Perry|first1=George L. W.|last2=Wheeler|first2=Andrew B.|last3=Wood|first3=Jamie R.|last4=Wilmshurst|first4=Janet M.|date=2014-12-01|title=A high-precision chronology for the rapid extinction of New Zealand moa (Aves, Dinornithiformes)|journal=Quaternary Science Reviews|volume=105|pages=126–135|bibcode=2014QSRv..105..126P|doi=10.1016/j.quascirev.2014.09.025}}</ref><ref name="Crowley-2010">{{Cite journal|last=Crowley|first=Brooke E.|date=2010-09-01|title=A refined chronology of prehistoric Madagascar and the demise of the megafauna|journal=Quaternary Science Reviews|series=Special Theme: Case Studies of Neodymium Isotopes in Paleoceanography|volume=29|issue=19–20|pages=2591–2603|bibcode=2010QSRv...29.2591C|doi=10.1016/j.quascirev.2010.06.030}}</ref> Only during the most recent parts of the extinction have [[Effect of climate change on plant biodiversity|plants also suffered large losses]].<ref>{{Cite web|title=Has Plant Life Reached Its Limits?|url=http://green.blogs.nytimes.com/2012/09/20/has-plant-life-reached-its-limits/?_r=0|website=Green Blog|access-date=2016-01-22|first=Sophia|last=Li|date=2012-09-20}}</ref>

=== Extinction rate ===
The contemporary rate of extinction of species is estimated at 100 to 1,000 times higher than the [[background extinction rate]], the historically typical rate of extinction (in terms of the natural evolution of the planet);<ref name="Pimm-1995">{{cite journal |last1=Pimm |first1=Stuart L. |last2=Russell |first2=Gareth J. |last3=Gittleman |first3=John L. |last4=Brooks |first4=Thomas M. |year=1995 |title=The Future of Biodiversity |journal=Science |volume=269 |issue=5222 |pages=347–350 |bibcode=1995Sci...269..347P |doi=10.1126/science.269.5222.347 |pmid=17841251 |s2cid=35154695}}</ref><ref name="Teyssèdre-2004" /><ref name="De Vos"/><ref name="lawton95">{{cite journal |author1=Lawton, J. H. |author2=May, R. M. |year=1995 |title=Extinction Rates |journal=Journal of Evolutionary Biology |volume=9 |pages=124–126 |doi=10.1046/j.1420-9101.1996.t01-1-9010124.x |doi-access=free}}</ref> also, the current rate of extinction is 10 to 100 times higher than in any of the previous [[mass extinction]]s in the history of Earth. One scientist estimates the current extinction rate may be 10,000 times the [[background extinction rate]], although most scientists predict a much lower extinction rate than this outlying estimate.<ref>{{cite journal |last1=Lawton |first1=J. H. |last2=May |first2=R. M. |year=1995 |title=Extinction Rates |journal=Journal of Evolutionary Biology |volume=9 |issue=1 |pages=124–126 |doi=10.1046/j.1420-9101.1996.t01-1-9010124.x |doi-access=free}}</ref> [[Theoretical ecologist]] [[Stuart Pimm]] stated that the extinction rate for plants is 100 times higher than normal.<ref>{{cite news |last=Li |first=S. |year=2012 |title=Has Plant Life Reached Its Limits? |newspaper=New York Times |url=http://green.blogs.nytimes.com/2012/09/20/has-plant-life-reached-its-limits/ |access-date=10 February 2018}}</ref>

Some contend that contemporary extinction has yet to reach the level of the previous five mass extinctions,<ref>{{cite news |last=Woodward |first=Aylin |date=April 8, 2019 |title=So many animals are going extinct that it could take Earth 10 million years to recover |work=Business Insider |url=https://www.businessinsider.com/mass-extinction-earth-take-10-million-years-recover-2019-4 |access-date=April 9, 2019 |quote="Lowery doesn't think we've strayed into Sixth Extinction territory yet. But he and Fraass agree that squabbling over what constitutes that distinction is beside the point. "We have to work to save biodiversity before it's gone. That's the important takeaway here," Lowery said. There is consensus on one aspect of the extinction trend, however: Homo sapiens are to blame. According to a 2014 study, current extinction rates are 1,000 times higher than they would be if humans weren't around."}}</ref> and that this comparison downplays how severe the first five mass extinctions were.<ref>{{cite web |last=Brannen |first=Peter |date=13 June 2017 |title=Earth Is Not in the Midst of a Sixth Mass Extinction |url=https://www.theatlantic.com/science/archive/2017/06/the-ends-of-the-world/529545/ |access-date=28 November 2020 |website=The Atlantic |quote=Many of those making facile comparisons between the current situation and past mass extinctions don’t have a clue about the difference in the nature of the data, much less how truly awful the mass extinctions recorded in the marine fossil record actually were.}}</ref> John Briggs argues that there is inadequate data to determine the real rate of extinctions, and shows that estimates of current species extinctions varies enormously, ranging from 1.5 species to 40,000 species going extinct due to human activities each year.<ref name="Briggs 2017">{{cite journal |last1=Briggs |first1=John C. |date=12 May 2017 |title=Emergence of a sixth mass extinction? |url=https://academic.oup.com/biolinnean/article/122/2/243/3869095 |journal=Biological Journal of the Linnean Society |volume=122 |issue=2 |pages=243–248 |doi=10.1093/biolinnean/blx063 |access-date=22 August 2021|doi-access=free }}</ref> Both papers from [[Anthony David Barnosky|Barnosky]] et al. (2011) and Hull et al. (2015) point out that the real rate of extinction during previous mass extinctions is unknown, both as only some organisms leave fossil remains, and as the temporal resolution of the fossil layer is larger than the time frame of the extinction events.<ref name="Barnosky2011" /><ref name="Hull et al. 2015">{{cite journal |last1=Hull |first1=Pincelli M. |last2=Darroch |first2=Simon A. F. |last3=Erwin |first3=Douglas H. |date=17 December 2015 |title=Rarity in mass extinctions and the future of ecosystems |journal=Nature |volume=528 |issue=7582 |pages=345–351 |doi=10.1038/nature16160 |pmid=26672552 |s2cid=4464936 |bibcode=2015Natur.528..345H}}</ref> However, all these authors agree that there is a modern [[Biodiversity loss|biodiversity crisis]] with population declines affecting numerous species, and that a future anthropogenic mass extinction event is a big risk. The 2011 study by Barnosky et al. confirms that "current extinction rates are higher than would be expected from the fossil record" and adds that anthropogenic ecological stressors, including climate change, [[habitat fragmentation]], pollution, overfishing, overhunting, invasive species, and expanding human [[Biomass (ecology)|biomass]], will intensify and accelerate extinction rates in the future without significant mitigation efforts.<ref name="Barnosky2011" />

In ''The Future of Life'' (2002), [[E.O. Wilson|Edward Osborne Wilson]] of Harvard calculated that, if the current rate of human disruption of the [[biosphere]] continues, one-half of Earth's higher lifeforms will be extinct by 2100. A 1998 poll conducted by the [[American Museum of Natural History]] found that 70% of biologists acknowledge an ongoing anthropogenic extinction event.<ref>{{cite web|url=http://www.mysterium.com/amnh.html |publisher=American Museum of Natural History Press Release|year=1998|title=National Survey Reveals Biodiversity Crisis – Scientific Experts Believe We are in Midst of Fastest Mass Extinction in Earth's History|access-date=10 February 2018}}</ref>

In a pair of studies published in 2015, extrapolation from observed extinction of Hawaiian snails led to the conclusion that 7% of all species on Earth may have been lost already.<ref name="Phys.org-2015">{{cite web |url=http://phys.org/news/2015-08-catastrophic-invertebrate-extinction-hawaii-globally.html |title=Research shows catastrophic invertebrate extinction in Hawai'i and globally|publisher=Phys.org |year=2015|access-date=10 February 2018}}</ref><ref>{{cite journal|title=Mass extinction in poorly known taxa|first1=Claire|last1=Régnier|first2=Guillaume|last2=Achaz|first3=Amaury|last3=Lambert|first4=Robert H.|last4=Cowie|first5=Philippe |last5=Bouchet|first6=Benoît|last6=Fontaine|date=23 June 2015 |journal=Proceedings of the National Academy of Sciences|volume=112|issue=25|pages=7761–7766 |doi=10.1073/pnas.1502350112|pmid=26056308|pmc=4485135 |bibcode=2015PNAS..112.7761R|doi-access=free}}</ref> A 2021 study published in the journal ''Frontiers in Forests and Global Change'' found that only around 3% of the planet's terrestrial surface is ecologically and [[fauna]]lly intact, meaning areas with healthy populations of native animal species and little to no human footprint.<ref>{{cite news |last=Carrington|first=Damian|date=April 15, 2021|title=Just 3% of world's ecosystems remain intact, study suggests|url=https://www.theguardian.com/environment/2021/apr/15/just-3-of-worlds-ecosystems-remain-intact-study-suggests|work=The Guardian|location=|access-date=April 16, 2021}}</ref><ref>{{cite journal |last1=Plumptre|first1=Andrew J.|last2=Baisero|first2=Daniele|display-authors=etal.|date=2021|title=Where Might We Find Ecologically Intact Communities?|journal=Frontiers in Forests and Global Change|volume=4|issue= |pages= |doi=10.3389/ffgc.2021.626635|bibcode=2021FrFGC...4.6635P |doi-access=free|hdl=10261/242175|hdl-access=free}}</ref>

The 2019 ''[[Global Assessment Report on Biodiversity and Ecosystem Services]]'', published by the [[United Nations]]' [[Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services]] (IPBES), posits that out of around eight million species of plants and animals, roughly one million species face extinction within decades as the result of human actions.<ref name="Stokstad" /><ref>{{cite news |last=Plumer |first=Brad |date=May 6, 2019 |title=Humans Are Speeding Extinction and Altering the Natural World at an 'Unprecedented' Pace |work=[[The New York Times]] |url=https://www.nytimes.com/2019/05/06/climate/biodiversity-extinction-united-nations.html |url-status=live |url-access=subscription |access-date=May 6, 2019 |archive-url=https://ghostarchive.org/archive/20220103/https://www.nytimes.com/2019/05/06/climate/biodiversity-extinction-united-nations.html |archive-date=2022-01-03 |quote=“Human actions threaten more species with global extinction now than ever before,” the report concludes, estimating that “around 1 million species already face extinction, many within decades, unless action is taken.”}}{{cbignore}}</ref><ref>{{cite press release |date=May 6, 2019 |title=Media Release: Nature's Dangerous Decline 'Unprecedented'; Species Extinction Rates 'Accelerating' |work=[[Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services]] |url=https://www.ipbes.net/media-release-nature%e2%80%99s-dangerous-decline-%e2%80%98unprecedented%e2%80%99-species-extinction-rates-%e2%80%98accelerating%e2%80%99 |access-date=May 6, 2019}}</ref><ref>{{cite news |date=May 6, 2019 |title=World is 'on notice' as major UN report shows one million species face extinction |work=UN News |url=https://news.un.org/en/story/2019/05/1037941 |access-date=January 8, 2020}}</ref> Organized human existence is jeopardized by increasingly rapid destruction of the systems that support life on Earth, according to the report, the result of one of the most comprehensive studies of the health of the planet ever conducted.<ref name="Watts2019" />  Moreover, the 2021 ''Economics of Biodiversity'' review, published by the UK government, asserts that "biodiversity is declining faster than at any time in human history."<ref>{{cite web |last=Dasgupta |first=Partha |author-link=Partha Dasgupta |date=2021 |title=The Economics of Biodiversity: The Dasgupta Review Headline Messages |publisher=UK government |page=1 |url=https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/957629/Dasgupta_Review_-_Headline_Messages.pdf |access-date=December 15, 2021 |quote=Biodiversity is declining faster than at any time in human history. Current extinction rates, for example, are around 100 to 1,000 times higher than the baseline rate, and they are increasing.}}</ref><ref>{{cite news |last=Carrington |first=Damian |date=February 2, 2021 |title=Economics of biodiversity review: what are the recommendations? |work=The Guardian |url=https://www.theguardian.com/environment/2021/feb/02/economics-of-biodiversity-review-what-are-the-recommendations |access-date=15 December 2021}}</ref> According to a  2022 study published in ''[[Frontiers in Ecology and the Environment]]'', a survey of more than 3,000 experts says that the extent of the mass extinction might be greater than previously thought, and estimates that roughly 30% of species "have been globally threatened or driven extinct since the year 1500."<ref>{{cite news |last=Melillo |first=Gianna|date=July 19, 2022 |title=Threat of global extinction may be greater than previously thought, study finds|work=The Hill |url=https://thehill.com/changing-america/sustainability/environment/3565945-threat-of-global-extinction-may-be-greater-than-previously-thought-study-finds/|access-date=July 20, 2022}}</ref><ref>{{cite journal|last1=Isbell |first1=Forest |last2=Balvanera|first2=Patricia|display-authors=etal.|date=2022 |title=Expert perspectives on global biodiversity loss and its drivers and impacts on people|journal=Frontiers in Ecology and the Environment |volume=21|issue=2|pages=94–103|doi=10.1002/fee.2536|s2cid=250659953|doi-access=free|hdl=10852/101242|hdl-access=free}}</ref> In a 2022 report, IPBES listed unsustainable fishing, [[hunting]], and [[Overlogging|logging]] as being some of the primary drivers of the global extinction crisis.<ref>{{cite news |last=Briggs|first=Helen |date=July 8, 2022 |title=Unsustainable logging, fishing and hunting 'driving extinction' |work=BBC|url=https://www.bbc.com/news/science-environment-62094405|access-date=August 8, 2022}}</ref> A 2022 study published in ''[[Science Advances]]'' suggests that if global warming reaches {{convert|2.7|C-change|F-change}} or {{convert|4.4|C-change|F-change}} by 2100, then 13% and 27% of terrestrial vertebrate species will go extinct by then, largely due to climate change (62%), with anthropogenic land conversion and co-extinctions accounting for the rest.<ref>{{cite news |last=Newcomb |first=Tim |date=January 18, 2023 |title=Supercomputer Says 27% of Life on Earth Will Be Dead by the End of This Century|url=https://www.popularmechanics.com/science/environment/a42556557/supercomputer-mass-extinction-predictions/|work=[[Popular Mechanics]] |location= |access-date=January 19, 2023}}</ref><ref name="Strona">{{cite journal |last1=Strona|first1=Giovanni |last2=Bradshaw|first2=Corey J. A. |date=2022 |title=Coextinctions dominate future vertebrate losses from climate and land use change|url= |journal=Science Advances |volume=8 |issue=50 |pages= eabn4345|doi=10.1126/sciadv.abn4345|pmid=36525487 |pmc=9757742 |bibcode=2022SciA....8N4345S |quote=The planet has entered the sixth mass extinction.}}</ref><ref>{{Cite journal |last1=Murali |first1=Gopal |last2=Iwamura |first2=Takuya Iwamura |last3=Meiri |first3=Shai |last4=Roll |first4=Uri |date=January 18, 2023 |title=Future temperature extremes threaten land vertebrates |url=https://www.nature.com/articles/s41586-022-05606-z |journal=Nature |volume=615 |issue=7952 |pages=461–467 |language=en |doi=10.1038/s41586-022-05606-z |pmid=36653454 |bibcode=2023Natur.615..461M |s2cid=255974196 }}</ref> A 2023 study published in ''[[PLOS One]]'' shows that around two million species are threatened with extinction, double the estimate put forward in the 2019 IPBES report.<ref>{{cite news |last=Weston|first=Phoebe |date=November 8, 2023 |title=Number of species at risk of extinction doubles to 2 million, says study|url=https://www.theguardian.com/environment/2023/nov/08/species-at-risk-extinction-doubles-to-2-million-aoe|work=The Guardian |location= |access-date=November 9, 2023}}</ref>

According to a 2023 study published in ''[[PNAS]]'', at least 73 [[genera]] of animals have gone extinct since 1500. If humans had never existed, the study estimates it would have taken 18,000 years for the same genera to have disappeared naturally, leading the authors to conclude that "the current generic extinction rates are 35 times higher than expected background rates prevailing in the last million years under the absence of human impacts" and that human civilization is causing the "rapid mutilation of the tree of life."<ref>{{cite news |last= Rozsa|first=Matthew|date=September 19, 2023 |title=Experts warn of a "biological holocaust" as human-caused extinction "mutilates" the tree of life|url=https://www.salon.com/2023/09/19/experts-warn-of-a-biological-holocaust-as-human-caused-extinction-mutilates-the-tree-of-life/|work=[[Salon.com]] |location= |access-date=September 19, 2023}}</ref><ref>{{cite journal |last1= Ceballos|first1=Gerardo|last2=Ehrlich|first2=Paul R.|date=2023 |title=Mutilation of the tree of life via mass extinction of animal genera|url= |journal=[[Proceedings of the National Academy of Sciences of the United States of America]]|volume=120 |issue=39 |pages=e2306987120|doi=10.1073/pnas.2306987120|pmid=37722053 |pmc=10523489 |bibcode=2023PNAS..12006987C |access-date=}}</ref><ref>{{cite news |last=Greenfield|first=Patrick |date=September 19, 2023 |title='Mutilating the tree of life': Wildlife loss accelerating, scientists warn|url=https://www.theguardian.com/environment/2023/sep/19/mutilating-the-tree-of-life-wildlife-loss-accelerating-scientists-warn|work=The Guardian |location= |access-date=September 19, 2023}}</ref>

=== Attribution ===
{{quote box|align=right|width=25em|quote=We are currently, in a systematic manner, exterminating all non-human living beings.|source=—[[Anne Larigauderie]], [[IPBES]] executive secretary<ref>{{cite book |last=Hickel |first=Jason|author-link=Jason Hickel|title=Less is More: How Degrowth Will Save the World |year=2021|publisher=Windmill Books|page=9|url=https://books.google.com/books?id=mLbIDwAAQBAJ&pg=PT17 |isbn=978-1786091215}}</ref>}}

There is widespread consensus among scientists that human activity is accelerating the extinction of many animal species through the destruction of habitats, the consumption of animals as resources, and the elimination of species that humans view as threats or competitors.<ref name="SpecialIssue"/> Rising extinction trends impacting numerous animal groups including mammals, birds, reptiles, and amphibians have prompted some scientists to declare a biodiversity crisis.<ref name="rapidrise">{{cite journal|last1=Andermann |first1=Tobias|last2=Faurby|first2=Søren|last3=Turvey|first3=Samuel T. |last4=Antonelli|first4=Alexandre |last5=Silvestro|first5=Daniele|title=The past and future human impact on mammalian diversity |journal=Science Advances|date=September 2020|volume=6|issue=36|at=eabb2313 |doi=10.1126/sciadv.abb2313 |pmid=32917612|pmc=7473673|bibcode=2020SciA....6.2313A|issn=2375-2548}} [[File:CC-BY icon.svg|50px]] Text and images are available under a [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License].</ref>

=== Scientific debate ===
[[File:Human population since 1800.png|alt=|thumb|World [[World population|human population]] since 1800 in billions. Data from the [https://population.un.org/wpp/ United Nations projections in 2019].]]
Characterization of recent extinction as a mass extinction has been debated among scientists. [[Stuart Pimm]], for example, asserts that the sixth mass extinction "is something that hasn't happened yet – we are on the edge of it."<ref name="Carrington">{{cite news |last=Carrington |first=Damian |date=10 July 2017 |title=Earth's sixth mass extinction event under way, scientists warn |work=The Guardian |url=https://www.theguardian.com/environment/2017/jul/10/earths-sixth-mass-extinction-event-already-underway-scientists-warn |access-date=November 4, 2017}}</ref> Several studies posit that the earth has entered a sixth mass extinction event,<ref name="dirzo" /><ref name="Wake2008" /><ref name="Ceballos-Ehrlich-2017-05" /><ref name="Ceballos2020" /> including a 2015 paper by Barnosky et al.<ref name=ceballos/> and a November 2017 statement titled "[[World Scientists' Warning to Humanity#Second notice|World Scientists' Warning to Humanity: A Second Notice]]", led by eight authors and signed by 15,364 scientists from 184 countries which asserted that, among other things, "we have unleashed a mass extinction event, the sixth in roughly 540 million years, wherein many current life forms could be extirpated or at least committed to extinction by the end of this century."<ref name="WorldScientists">{{cite journal|vauthors=Ripple WJ, Wolf C, Newsome TM, Galetti M, Alamgir M, Crist E, Mahmoud MI, Laurance WF|title=World Scientists' Warning to Humanity: A Second Notice|journal=[[BioScience]] |volume=67|issue=12|pages=1026–1028|date=13 November 2017|doi=10.1093/biosci/bix125 |url=http://scientistswarning.forestry.oregonstate.edu/sites/sw/files/Warning_article_with_supp_11-13-17.pdf|quote=Moreover, we have unleashed a mass extinction event, the sixth in roughly 540 million years, wherein many current life forms could be annihilated or at least committed to extinction by the end of this century.|access-date=12 July 2018|url-status=dead|archive-date=15 December 2019|archive-url=https://web.archive.org/web/20191215010626/https://scientistswarning.forestry.oregonstate.edu/sites/sw/files/Warning_article_with_supp_11-13-17.pdf}}</ref> The [[World Wide Fund for Nature]]'s 2020 ''[[Living Planet Report]]'' says that [[wildlife]] populations have declined by 68% since 1970 as a result of [[overconsumption]], [[population growth]], and [[intensive farming]], which is further evidence that humans have unleashed a sixth mass extinction event; however, this finding has been disputed by one 2020 study, which posits that this major decline was primarily driven by a few extreme outlier populations, and that when these outliers are removed, the trend shifts to that of a decline between the 1980s and 2000s, but a roughly positive trend after 2000.<ref>{{cite news|last=Greenfield |first=Patrick|date=September 9, 2020|title=Humans exploiting and destroying nature on unprecedented scale – report|url=https://www.theguardian.com/environment/2020/sep/10/humans-exploiting-and-destroying-nature-on-unprecedented-scale-report-aoe|work=The Guardian|access-date=September 10, 2020}}</ref><ref>{{cite news|last=Briggs|first=Helen|date=September 10, 2020|title=Wildlife in 'catastrophic decline' due to human destruction, scientists warn |url=https://www.bbc.com/news/science-environment-54091048|work=BBC|access-date=September 10, 2020}}</ref><ref name="Lewis2020">{{cite news|last=Lewis |first=Sophie|date=September 9, 2020|title=Animal populations worldwide have declined by almost 70% in just 50 years, new report says|url=https://www.cbsnews.com/news/biodiversity-endangered-species-animal-population-decline-world-wildlife-fund-report-2020-09-09/|work=[[CBS News]]|access-date=October 22, 2020}}</ref><ref>{{Cite journal|last1=Leung|first1=Brian|last2=Hargreaves|first2=Anna L. |last3=Greenberg|first3=Dan A.|last4=McGill|first4=Brian|last5=Dornelas|first5=Maria|last6=Freeman |first6=Robin |date=December 2020|title=Clustered versus catastrophic global vertebrate declines |journal=Nature|volume=588|issue=7837|pages=267–271|doi=10.1038/s41586-020-2920-6|pmid=33208939 |bibcode=2020Natur.588..267L |hdl=10023/23213|s2cid=227065128|issn=1476-4687|hdl-access=free}}</ref> A 2021 report in ''Frontiers in Conservation Science'' which cites both of the aforementioned studies, says "population sizes of vertebrate species that have been monitored across years have declined by an average of 68% over the last five decades, with certain population clusters in extreme decline, thus presaging the imminent extinction of their species," and asserts "that we are already on the path of a sixth major extinction is now scientifically undeniable."<ref name="Bradshaw2021">{{cite journal|last1=Bradshaw |first1=Corey J. A.|last2=Ehrlich|first2=Paul R. |last3=Beattie|first3=Andrew |last4=Ceballos |first4=Gerardo|last5=Crist|first5=Eileen|last6=Diamond|first6=Joan|last7=Dirzo|first7=Rodolfo |last8=Ehrlich|first8=Anne H.|last9=Harte|first9=John|last10=Harte|first10=Mary Ellen|last11=Pyke |first11=Graham |last12=Raven|first12=Peter H.|last13=Ripple|first13=William J.|last14=Saltré |first14=Frédérik|last15=Turnbull|first15=Christine|last16=Wackernagel|first16=Mathis|last17=Blumstein |first17=Daniel T.|date=2021 |title=Underestimating the Challenges of Avoiding a Ghastly Future |journal=Frontiers in Conservation Science|volume=1|issue=|pages=|doi=10.3389/fcosc.2020.615419|doi-access=free}}</ref> A January 2022 [[review article]] published in ''Biological Reviews'' builds upon previous studies documenting biodiversity decline to assert that a sixth mass extinction event caused by anthropogenic activity is currently underway.<ref name="Cowie">{{cite journal |last1=Cowie |first1=Robert H. |last2=Bouchet |first2=Philippe |last3=Fontaine |first3=Benoît |date=2022 |title=The Sixth Mass Extinction: fact, fiction or speculation? |journal=Biological Reviews |volume=97 |issue=2 |pages=640–663 |doi=10.1111/brv.12816 |pmid=35014169 |pmc=9786292 |quote=Our review lays out arguments clearly demonstrating that there is a biodiversity crisis, quite probably the start of the Sixth Mass Extinction. |s2cid=245889833}}</ref><ref>{{cite news|last=Sankaran |first=Vishwam |date=January 17, 2022|title=Study confirms sixth mass extinction is currently underway, caused by humans|work=[[The Independent]] |url=https://www.independent.co.uk/climate-change/news/sixth-mass-extinction-global-biodiversity-b1994346.html|access-date=January 17, 2022}}</ref> A December 2022 study published in ''[[Science Advances]]'' states that "the planet has entered the sixth mass extinction" and warns that current anthropogenic trends, particularly regarding climate and [[land-use change]]s, could result in the loss of more than a tenth of plant and animal species by the end of the century.<ref>{{cite journal |last1=Strona |first1= Giovanni |last2=Bradshaw |first2=Corey J. A. |date=16 December 2022 |title=Coextinctions dominate future vertebrate losses from climate and land use change|url= |journal=Science Advances|volume=8 |issue=50 |pages= eabn4345|doi=10.1126/sciadv.abn4345|pmid= 36525487 |pmc= 9757742 |bibcode= 2022SciA....8N4345S |s2cid= 254803380 |access-date=}}</ref><ref>{{cite news |last=Greenfield |first=Patrick |date=16 December 2022 |title=More than 1 in 10 species could be lost by end of century, study warns|url=https://www.theguardian.com/environment/2022/dec/16/more-than-1-in-10-species-could-be-lost-by-end-of-century-study-warns-aoe|work=The Guardian |location= |access-date=18 December 2022}}</ref> A 2023 study published in ''Biological Reviews'' found that, of 70,000 monitored species, some 48% are experiencing population declines from anthropogenic pressures, whereas only 3% have increasing populations.<ref>{{cite news|author=<!--not stated--> |date=May 23, 2023 |title=Biodiversity: Almost half of animals in decline, research shows|url=https://www.bbc.com/news/uk-northern-ireland-65681648|work=BBC |location= |access-date=May 23, 2023}}</ref><ref>{{cite journal |last1=Finn|first1=Catherine|last2=Grattarola|first2=Florencia |last3=Pincheira-Donoso|first3=Daniel |date=2023 |title=More losers than winners: investigating Anthropocene defaunation through the diversity of population trends|url= |journal=Biological Reviews|volume= 98|issue= 5|pages= 1732–1748|doi=10.1111/brv.12974|pmid=37189305 |s2cid=258717720 |access-date=}}</ref><ref>{{cite news |last=Paddison|first= Laura |date=May 22, 2023|title=Global loss of wildlife is 'significantly more alarming' than previously thought, according to a new study|url=https://www.cnn.com/2023/05/22/world/wildlife-crisis-biodiversity-scn-climate-intl/index.html|work=CNN |location= |access-date=May 23, 2023}}</ref>

According to the [[UNDP]]'s 2020 [[Human Development Report]], ''The Next Frontier: Human Development and the Anthropocene'':

{{blockquote|text=The planet's biodiversity is plunging, with a quarter of species facing extinction, many within decades. Numerous experts believe we are living through, or on the cusp of, a mass species extinction event, the sixth in the history of the planet and the first to be caused by a single organism—us.<ref>{{cite web|url=http://hdr.undp.org/sites/default/files/hdr_2020_overview_english.pdf|title=The Next Frontier: Human Development and the Anthropocene|date=December 15, 2020|page=3|publisher=UNDP|access-date= December 16, 2020}}</ref>}}

The 2022 ''Living Planet Report'' found that vertebrate wildlife populations have plummeted by an average of almost 70% since 1970, with [[agriculture]] and [[fishing]] being the primary drivers of this decline.<ref>{{cite news |last=Greenfield|first=Patrick |date=October 12, 2022 |title=Animal populations experience average decline of almost 70% since 1970, report reveals |url=https://www.theguardian.com/environment/2022/oct/13/almost-70-of-animal-populations-wiped-out-since-1970-report-reveals-aoe|work=The Guardian |access-date=October 15, 2022}}</ref><ref>{{cite news |last= Einhorn|first=Catrin|date=October 12, 2022 |title=Researchers Report a Staggering Decline in Wildlife. Here's How to Understand It.|url=https://www.nytimes.com/2022/10/12/climate/living-planet-index-wildlife-declines.html|work=The New York Times |location= |access-date=October 15, 2022}}</ref>

Some scientists, including [[Rodolfo Dirzo]] and [[Paul R. Ehrlich]], contend that the sixth mass extinction is largely unknown to most people globally and is also misunderstood by many in the scientific community. They say it is not the disappearance of species, which gets the most attention, that is at the heart of the crisis, but "the existential threat of myriad population extinctions."<ref name="Dirzo2022">{{cite journal |last1=Dirzo |first1=Rodolfo|last2=Ceballos|first2=Gerardo|last3=Ehrlich |first3=Paul R. |date=2022 |title=Circling the drain: the extinction crisis and the future of humanity |journal=[[Philosophical Transactions of the Royal Society B]] |volume=377|issue=1857 |pages= |doi=10.1098/rstb.2021.0378|pmid=35757873 |pmc=9237743}}</ref>

===Anthropocene===
{{Main|Anthropocene}}
[[File:Ecological Processes Coral Reefs.jpg|thumb|upright=1.3|A diagram showing the ecological processes of [[coral reef]]s before and during the [[Anthropocene]]]]
The abundance of species extinctions considered [[human impact on the environment|anthropogenic]], or due to human activity, has sometimes (especially when referring to hypothesized future events) been collectively called the "Anthropocene extinction".<ref name="SpecialIssue"/><ref name="wooldridge2008">{{cite journal|doi=10.5194/bgd-5-2401-2008|last=Wooldridge|first=S. A.|date=9 June 2008|title=Mass extinctions past and present: a unifying hypothesis|journal=Biogeosciences Discussions|volume=5 |pages=2401–2423|issue=3|url=https://hal.archives-ouvertes.fr/hal-00298014/file/bgd-5-2401-2008.pdf |bibcode=2008BGD.....5.2401W|s2cid=2346412 |doi-access=free }}</ref><ref name="jackson2008">{{Cite journal|issn=0027-8424 |pmid=18695220|pmc=2556419|doi=10.1073/pnas.0802812105|date=Aug 2008 |title=Colloquium paper: ecological extinction and evolution in the brave new ocean |journal=Proceedings of the National Academy of Sciences of the United States of America|volume=105|issue=Suppl 1|pages=11458–11465|last1=Jackson|first1=J. B. C. |bibcode=2008PNAS..10511458J|doi-access=free}}</ref> ''[[Anthropocene]]'' is a term introduced in 2000.<ref name="Crutzen-2000">{{cite journal|last1=Crutzen|first1=Paul J.|last2=Stoermer|first2=Eugene F. |title=The 'Anthropocene'|journal=Global Change NewsLetter|issue=41|date=May 2000|publisher=[[IGBP]] |url=http://www.igbp.net/download/18.316f18321323470177580001401/1376383088452/NL41.pdf <!--|alternate-url=https://vodblogsite.org/wp-content/uploads/2020/09/4_The-Antropocene.pdf-->|issn=0284-5865|page=17}}</ref><ref name="NatGeo-2019">{{cite web|author=National Geographic Society|title=Anthropocene |url=https://education.nationalgeographic.org/resource/anthropocene/|date=June 7, 2019|website=National Geographic|access-date=23 November 2021|quote=coined and made popular by biologist Eugene Stormer and chemist Paul Crutzen in 2000.}}</ref> Some now postulate that a new geological epoch has begun, with the most abrupt and widespread extinction of species since the [[Cretaceous–Paleogene extinction event]] 66 million years ago.<ref name="Kolbert-2014" />

The term "anthropocene" is being used more frequently by scientists, and some commentators may refer to the current and projected future extinctions as part of a longer Holocene extinction.<ref name="Zalasiewicz"/><ref>{{cite book|last=Elewa|first=Ashraf M. T.|chapter=Current mass extinction |title=Mass Extinction|pages=191–194 |doi=10.1007/978-3-540-75916-4_14|year=2008|isbn=978-3-540-75915-7}}</ref> The Holocene–Anthropocene boundary is contested, with some commentators asserting significant human influence on climate for much of what is normally regarded as the [[Holocene]] [[Epoch (geology)|Epoch]].<ref name="Ruddiman-2003"/> Other commentators place the Holocene–Anthropocene boundary at the [[industrial revolution]] and also say that "[f]ormal adoption of this term in the near future will largely depend on its utility, particularly to earth scientists working on late Holocene successions."

It has been suggested that human activity has made the period starting from the mid-20th century different enough from the rest of the Holocene to consider it a new [[geological epoch]], known as the Anthropocene,<ref>{{cite journal|last1=Syvitski|first1=Jaia|last2=Waters|first2=Colin N.|last3=Day |first3=John |last4=Milliman |first4=John D. |last5=Summerhayes |first5=Colin |last6=Steffen |first6=Will |last7=Zalasiewicz |first7=Jan |last8=Cearreta |first8=Alejandro |last9=Gałuszka |first9=Agnieszka |last10=Hajdas |first10=Irka |last11=Head |first11=Martin J. |last12=Leinfelder |first12=Reinhold |last13=McNeill |first13=J. R. |last14=Poirier |first14=Clément |last15=Rose |first15=Neil L. |last16=Shotyk |first16=William |last17=Wagreich |first17=Michael |last18=Williams |first18=Mark |date=2020|title=Extraordinary human energy consumption and resultant geological impacts beginning around 1950 CE initiated the proposed Anthropocene Epoch |journal=Communications Earth & Environment|volume=1|issue=1 |at=32|doi=10.1038/s43247-020-00029-y |bibcode=2020ComEE...1...32S|s2cid=222415797 |doi-access=free|hdl=20.500.11850/462514 |hdl-access=free }}</ref><ref>{{Cite journal|title=The Anthropocene is functionally and stratigraphically distinct from the Holocene|journal=Science|date=2016-01-08|issn=0036-8075|pmid=26744408|at=aad2622 |volume=351|issue=6269 |doi=10.1126/science.aad2622|first1=Colin N.|last1=Waters|first2=Jan |last2=Zalasiewicz|first3=Colin|last3=Summerhayes|first4=Anthony D. |last4=Barnosky|first5=Clément |last5=Poirier|first6=Agnieszka|last6=Gałuszka |first7=Alejandro|last7=Cearreta|first8=Matt |last8=Edgeworth|first9=Erle C.|last9=Ellis|s2cid=206642594}}</ref> a term which was considered for inclusion in the timeline of Earth's history by the [[International Commission on Stratigraphy]] in 2016.<ref>{{Cite web|title=Working Group on the 'Anthropocene'|publisher=Subcommission on Quaternary Stratigraphy |url=http://quaternary.stratigraphy.org/workinggroups/anthropocene/|access-date=21 January 2016}}</ref><ref>{{cite news |url=https://www.theguardian.com/environment/2016/aug/29/declare-anthropocene-epoch-experts-urge-geological-congress-human-impact-earth|title=The Anthropocene epoch: scientists declare dawn of human-influenced age|first=Damian|last=Carrington|date=August 29, 2016 |work=The Guardian|access-date= August 30, 2016}}</ref> In order to constitute the Holocene as an [[extinction event]], scientists must determine exactly when anthropogenic [[greenhouse gas emissions]] began to measurably alter natural atmospheric levels on a global scale, and when these alterations caused changes to global climate. Using chemical proxies from Antarctic ice cores, researchers have estimated the fluctuations of [[carbon dioxide]] (CO<sub>2</sub>) and [[methane]] (CH<sub>4</sub>) gases in the Earth's atmosphere during the [[Late Pleistocene]] and Holocene epochs.<ref name="Ruddiman-2003">{{Cite journal|last=Ruddiman|first=W. F.|date=2003|title=The anthropogenic greenhouse gas era began thousands of years ago|url=http://www.arp.harvard.edu/sci/climate/journalclub/Ruddiman2003.pdf|archive-url=https://web.archive.org/web/20060903232016/http://www.arp.harvard.edu/sci/climate/journalclub/Ruddiman2003.pdf|archive-date=2006-09-03|url-status=dead|journal=Climatic Change|volume=61|issue=3|pages=261–293 |doi=10.1023/b:clim.0000004577.17928.fa|citeseerx=10.1.1.651.2119|s2cid=2501894}}</ref> Estimates of the fluctuations of these two gases in the atmosphere, using chemical proxies from Antarctic ice cores, generally indicate that the peak of the Anthropocene occurred within the previous two centuries: typically beginning with the [[Industrial Revolution]], when the highest greenhouse gas levels were recorded.<ref name="Cruzten-2002">{{Cite journal |last=Cruzten|first=P. J.|date=2002|title=Geology of mankind: The Anthropocene|journal=Nature|volume=415|issue=6867|page=23|doi=10.1038/415023a|pmid=11780095 |bibcode=2002Natur.415...23C|s2cid=9743349|doi-access=free}}</ref><ref>{{cite journal|first1=Will|last1=Steffen |first2=Åsa|last2=Persson|first3=Lisa|last3=Deutsch|first4=Jan|last4=Zalasiewicz|first5=Mark |last5=Williams|first6=Katherine|last6=Richardson|first7=Carole|last7=Crumley|first8=Paul |last8=Crutzen |first9=Carl|last9=Folke|first10=Line|last10=Gordon|first11=Mario|last11=Molina|first12=Veerabhadran |last12=Ramanathan|first13=Johan|last13=Rockström|first14=Marten|last14=Scheffer|first15=Hans Joachim |last15=Schellnhuber|first16=Uno|last16=Svedin|year=2011|title=The Anthropocene: From Global Change to Planetary Stewardship|journal=Ambio|volume=40|issue=7|pages=739–761|doi=10.1007/s13280-011-0185-x |pmc=3357752 |pmid=22338713|bibcode=2011Ambio..40..739S }}</ref>

=== Human ecology ===
{{Further|Human ecology}}
A 2015 article in [[Science (journal)|''Science'']] suggested that humans are unique in ecology as an unprecedented "global superpredator", regularly preying on large numbers of fully grown terrestrial and marine [[apex predators]], and with a great deal of influence over food webs and climatic systems worldwide.<ref name="Darimont-2015" /> Although significant debate exists as to how much human predation and indirect effects contributed to prehistoric extinctions, certain population crashes have been directly correlated with human arrival.<ref name="Faurby2015" /><ref name="Kolbert-2014" /><ref name="link.springer.com" /><ref name="SpecialIssue" /> Human activity has been the main cause of mammalian extinctions since the Late Pleistocene.<ref name="rapidrise" /> A 2018 study published in ''[[PNAS]]'' found that since the dawn of human civilization, the [[Biomass (ecology)|biomass]] of wild mammals has decreased by 83%. The biomass decrease is 80% for marine mammals, 50% for plants, and 15% for fish. Currently, livestock make up 60% of the biomass of all mammals on earth, followed by humans (36%) and wild mammals (4%). As for birds, 70% are domesticated, such as poultry, whereas only 30% are wild.<ref name="Carrington2018">{{cite news|last=Carrington|first=Damian |date=May 21, 2018|title=Humans just 0.01% of all life but have destroyed 83% of wild mammals – study |work=The Guardian |url=https://www.theguardian.com/environment/2018/may/21/human-race-just-001-of-all-life-but-has-destroyed-over-80-of-wild-mammals-study|access-date=May 25, 2018}}</ref><ref name="Biomass2018">{{cite journal|last1=Bar-On |first1=Yinon M.|last2=Phillips|first2=Rob|last3=Milo |first3=Ron|year=2018|title=The biomass distribution on Earth|journal=Proceedings of the National Academy of Sciences|volume=115|issue=25|pages=6506–6511|pmc=6016768 |doi=10.1073/pnas.1711842115 |pmid=29784790|bibcode=2018PNAS..115.6506B |doi-access=free}}</ref>

==Historic extinction==
{{See also|Megafauna#Megafaunal_mass_extinctions|label 1=Megafaunal mass extinctions|Quaternary extinction}}

===Human activity===
====Activities contributing to extinctions====
[[File:Extinctions Africa Austrailia NAmerica Madagascar.gif|thumb|The percentage of [[megafauna]] on different land masses over time, with the arrival of humans indicated.]]
Extinction of animals, plants, and other organisms caused by human actions may go as far back as the late [[Pleistocene]], over 12,000 years ago.<ref name="SpecialIssue"/> There is a correlation between megafaunal extinction and the arrival of humans.<ref>{{cite journal|last1=Sandom|first1=Christopher |last2=Faurby|first2=Søren|last3= Sandel|first3=Brody|last4= Svenning|first4=Jens-Christian|date= 4 June 2014|title=Global late Quaternary megafauna extinctions linked to humans, not climate change|journal=[[Proceedings of the Royal Society B]]|volume=281|issue= 1787|page= 20133254|doi=10.1098/rspb.2013.3254 |pmid=24898370|pmc=4071532}}</ref><ref>{{cite journal |last1=Smith|first1=Felisa A.|last2=Elliott Smith|first2=Rosemary E. |last3=Lyons |first3=S. Kathleen |last4=Payne |first4=Jonathan L.|date=April 20, 2018|title=Body size downgrading of mammals over the late Quaternary |journal=Science|volume=360 |issue=6386|pages=310–313|doi=10.1126/science.aao5987|pmid=29674591|bibcode=2018Sci...360..310S|doi-access=free}}</ref><ref>{{cite journal|last1=Dembitzer|first1=Jacob|last2=Barkai|first2=Ran |last3=Ben-Dor|first3=Miki|last4=Meiri|first4=Shai|date=2022|title=Levantine overkill: 1.5 million years of hunting down the body size distribution|journal=[[Quaternary Science Reviews]]|volume=276|issue=|page=107316 |doi=10.1016/j.quascirev.2021.107316|bibcode=2022QSRv..27607316D|s2cid=245236379}}</ref> Megafauna that are still extant also suffered severe declines that were highly correlated with human expansion and activity.<ref>{{Cite journal |last1=Bergman |first1=Juraj |last2=Pedersen |first2=Rasmus Ø |last3=Lundgren |first3=Erick J. |last4=Lemoine |first4=Rhys T. |last5=Monsarrat |first5=Sophie |last6=Pearce |first6=Elena A. |last7=Schierup |first7=Mikkel H. |last8=Svenning |first8=Jens-Christian |date=24 November 2023 |title=Worldwide Late Pleistocene and Early Holocene population declines in extant megafauna are associated with Homo sapiens expansion rather than climate change |journal=[[Nature Communications]] |language=en |volume=14 |issue=1 |pages=7679 |doi=10.1038/s41467-023-43426-5 |pmid=37996436 |issn=2041-1723 |pmc=10667484 |bibcode=2023NatCo..14.7679B }}</ref> Over the past 125,000 years, the average body size of wildlife has fallen by 14% as actions by prehistoric humans eradicated [[megafauna]] on all continents with the exception of Africa.<ref>{{cite news|last=Carrington |first=Damian|date=May 23, 2019|title=Humans causing shrinking of nature as larger animals die off |work=The Guardian |url=https://www.theguardian.com/environment/2019/may/23/humans-causing-shrinking-of-nature-as-larger-animals-die-off|access-date=May 23, 2019}}</ref>

[[Civilization|Human civilization]] was founded on and grew from [[agriculture]].<ref name="Ruddiman-2009" /> The more land used for farming, the greater the population a civilization could sustain,<ref name="Ruddiman-2003"/><ref name="Ruddiman-2009">{{Cite journal|last=Ruddiman|first=W.F.|date=2009|title=Effect of per-capita land use changes on Holocene forest clearance and CO<sub>2</sub> emissions|journal=Quaternary Science Reviews |volume=28|issue=27–28|pages=3011–3015|doi=10.1016/j.quascirev.2009.05.022|bibcode=2009QSRv...28.3011R}}</ref> and subsequent popularization of farming led to widespread habitat conversion.<ref name="PimmJenkins"/>

[[Habitat destruction#Human causes|Habitat destruction by humans]], thus replacing the original local ecosystems, is a major driver of extinction.<ref>{{cite journal|last1=Vitousek|first1=P. M.|last2=Mooney |first2=H. A. |last3=Lubchenco|first3=J.|last4=Melillo|first4=J. M.|year=1997|title=Human Domination of Earth's Ecosystems|journal=Science|volume=277|issue=5325|pages=494–499|doi=10.1126/science.277.5325.494 |citeseerx=10.1.1.318.6529|s2cid=8610995 }}</ref> The sustained conversion of biodiversity rich forests and wetlands into poorer fields and pastures (of lesser carrying capacity for wild species), over the last 10,000 years, has considerably reduced the Earth's carrying capacity for wild birds and mammals, among other organisms, in both population size and species count.<ref name=Biodiversity-Global-Change-chapter2>{{cite book |last=Teyssèdre|first=A.|year=2004|title= Towards a sixth mass extinction crisis?|chapter=Biodiversity and Global Change|location=Paris|publisher=ADPF|isbn=978-2-914-935289}}</ref><ref>{{cite journal |last1=Gaston|first1=K.J.|last2=Blackburn|first2=T.N.G.|last3=Klein Goldewijk|first3=K. |year=2003 |title=Habitat conversion and global avian biodiversity loss|journal=Proceedings of the Royal Society B |volume=270|issue=1521|pages=1293–1300|doi=10.1098/rspb.2002.2303|pmid=12816643|pmc=1691371}}</ref><ref>{{cite journal|last1=Teyssèdre|first1=A.|last2=Couvet|first2=D.|year=2007|title=Expected impact of agriculture expansion on the global avifauna|journal=C. R. Biologies|volume=30|issue=3|pages= 247–254 |doi=10.1016/j.crvi.2007.01.003|pmid=17434119|url=https://comptes-rendus.academie-sciences.fr/biologies/articles/10.1016/j.crvi.2007.01.003/ }}</ref>

Other, related human causes of the extinction event include [[deforestation]], [[hunting]], [[pollution]],<ref>{{cite web|date=2008-11-06|website=[[Reuters]]|url=https://www.reuters.com/article/us-extinct-idUSTRE4A501920081106|title=Measuring extinction, species by species|access-date=2010-05-20 |archive-url=https://web.archive.org/web/20130502002359/http://www.reuters.com/article/2008/11/06/us-extinct-idUSTRE4A501920081106 |archive-date=2013-05-02|url-status=live}}</ref> the introduction in various regions of [[Invasive species|non-native species]], and the [[globalization and disease|widespread]] [[transmission (medicine)|transmission]] of [[infectious disease]]s spread through livestock and crops.<ref name=lawton95/>

==== Agriculture and climate change ====
[[File:Operação Hymenaea, Julho-2016 (29399454651).jpg|thumb|[[Deforestation of the Amazon rainforest|Deforestation]] in the [[Maranhão]] state, Brazil, in July 2016]]
Recent investigations into the practice of landscape burning during the [[Neolithic Revolution]] have a major implication for the current debate about the timing of the Anthropocene and the role that humans may have played in the production of greenhouse gases prior to the [[Industrial Revolution]].<ref name="Ruddiman-2009" /> Studies of early hunter-gatherers raise questions about the current use of population size or density as a [[Proxy (climate)|proxy]] for the amount of land clearance and anthropogenic burning that took place in pre-industrial times.<ref name="Lynch-2011">{{Cite web|url=https://climate.nasa.gov/news/649/|title=Secrets from the past point to rapid climate change in the future|last=Lynch|first=Patrick|date=15 December 2011|publisher=NASA's Earth Science News Team|access-date=2 April 2016}}</ref><ref name="Ruddiman-2013">{{Cite journal|last=Ruddiman|first=W.F.|date=2013|title=The Anthropocene|journal=Annual Review of Earth and Planetary Sciences|volume=41|pages=45–68|doi=10.1146/annurev-earth-050212-123944|bibcode=2013AREPS..41...45R}}</ref> Scientists have questioned the correlation between population size and early territorial alterations.<ref name="Ruddiman-2013" /> Ruddiman and Ellis' research paper in 2009 makes the case that early farmers involved in systems of agriculture used more land per capita than growers later in the Holocene, who intensified their labor to produce more food per unit of area (thus, per laborer); arguing that agricultural involvement in rice production implemented thousands of years ago by relatively small populations created significant environmental impacts through large-scale means of deforestation.<ref name="Ruddiman-2009" />

While a number of human-derived factors are recognized as contributing to rising atmospheric concentrations of CH<sub>4</sub> (methane) and CO<sub>2</sub> (carbon dioxide), deforestation and territorial clearance practices associated with agricultural development may have contributed most to these concentrations globally in earlier millennia.<ref name="Cruzten-2002" /><ref name="Ruddiman-2009" /><ref name="Tollefson-2011" /> Scientists that are employing a variance of [[Archaeology|archaeological]] and paleoecological data argue that the processes contributing to substantial human modification of the environment spanned many thousands of years on a global scale and thus, not originating as late as the [[Industrial Revolution]]. Palaeoclimatologist [[William Ruddiman]] has argued that in the early Holocene 11,000 years ago, atmospheric carbon dioxide and methane levels fluctuated in a pattern which was different from the Pleistocene epoch before it.<ref name="Ruddiman-2003"/><ref name="Lynch-2011" /><ref name="Tollefson-2011">{{Cite journal|last=Tollefson|first=Jeff|date=2011-03-25|title=The 8,000-year-old climate puzzle|url=http://www.nature.com/news/2011/110325/full/news.2011.184.html|journal=Nature News|doi=10.1038/news.2011.184|doi-access=free}}</ref> He argued that the patterns of the significant decline of CO<sub>2</sub> levels during the last ice age of the Pleistocene inversely correlate to the Holocene where there have been dramatic increases of CO<sub>2</sub> around 8000 years ago and CH<sub>4</sub> levels 3000 years after that.<ref name="Tollefson-2011" /> The correlation between the decrease of CO<sub>2</sub> in the Pleistocene and the increase of it during the [[Holocene]] implies that the causation of this spark of greenhouse gases into the atmosphere was the growth of [[Agriculture|human agriculture]] during the Holocene.<ref name="Ruddiman-2003"/><ref name="Tollefson-2011" />

===Climate change===
[[File:Aridity ice age vs early holocene vs modern.jpg|thumb|right|''Top:'' [[Arid]] ice age climate{{Clear}}''Middle:'' [[Atlantic period|Atlantic Period]], warm and wet{{Clear}}''Bottom:'' Potential vegetation in climate now if not for human effects like agriculture.<ref name=ORNL_paleoclimate>{{Cite web|title=Global land environments since the last interglacial
|last=Adams | first=Jonathan M. | year=1997
|url=https://www.esd.ornl.gov/projects/qen/nerc.html|access-date=2023-01-06
|archive-url=https://web.archive.org/web/20080116122058/http://www.esd.ornl.gov/projects/qen/nerc.html|archive-date=2008-01-16
|publisher=Oak Ridge National Laboratory, TN, USA}}</ref>]]
One of the main theories explaining early Holocene extinctions is [[climate change (general concept)|historic climate change]]. The climate change theory has suggested that a change in climate near the end of the late Pleistocene stressed the megafauna to the point of extinction.<ref name="Zalasiewicz">{{cite journal|last=Zalasiewicz|first=Jan|author2=Williams, Mark|author3=Smith, Alan|author4=Barry, Tiffany L. |author5=Coe, Angela L.|author6=Bown, Paul R.|author7=Brenchley, Patrick|author8=Cantrill, David |author9=Gale, Andrew|author10=Gibbard, Philip|author11=Gregory, F. John|author12=Hounslow, Mark W. |author13=Kerr, Andrew C.|author14=Pearson, Paul|author15=Knox, Robert|author16=Powell, John |author17=Waters, Colin|author18=Marshall, John|author19=Oates, Michael|author20=Rawson, Peter |author21=Stone, Philip|title=Are we now living in the Anthropocene|journal=GSA Today|year=2008 |volume=18|issue=2|pages=4|doi=10.1130/GSAT01802A.1|bibcode=2008GSAT...18b...4Z |doi-access=free}}</ref><ref>{{cite book|last1=Graham |first1=R. W.|last2=Mead|first2=J. I.|year=1987|chapter=Environmental fluctuations and evolution of mammalian faunas during the last deglaciation in North America|editor1-last=Ruddiman|editor1-first=W. F. |editor2-last=Wright|editor2-first=J. H. E.|title=North America and Adjacent Oceans During the Last Deglaciation |volume=K-3|series=The Geology of North America|publisher=[[Geological Society of America]] |isbn=978-0-8137-5203-7}}</ref> Some scientists favor abrupt climate change as the catalyst for the extinction of the megafauna at the end of the Pleistocene, most who believe increased hunting from early modern humans also played a part, with others even suggesting that the two interacted.<ref name="Kolbert-2014" /><ref>{{cite book|last=Martin |first=P. S. |year=1967 |chapter=Prehistoric overkill |title=Pleistocene extinctions: The search for a cause|editor1-first=P. S. |editor1-last=Martin|editor2-first=H. E.|editor2-last=Wright|location=New Haven|publisher=Yale University Press|isbn=978-0-300-00755-8}}</ref><ref>{{cite journal|author=Lyons, S.K.|author2=Smith, F.A.|author3=Brown, J.H.|title=Of mice, mastodons and men: human-mediated extinctions on four continents|journal=Evolutionary Ecology Research |volume=6|pages=339–358|url=http://biology.unm.edu/fasmith/Web_Page_PDFs/Lyons_et_al_2004_EER.pdf |year=2004|access-date=18 October 2012|url-status=dead|archive-date=6 March 2012|archive-url=https://web.archive.org/web/20120306013121/http://biology.unm.edu/fasmith/Web_Page_PDFs/Lyons_et_al_2004_EER.pdf}}</ref> In the Americas, a controversial explanation for the shift in climate is presented under the [[Younger Dryas impact hypothesis]], which states that the impact of comets cooled global temperatures.<ref name="PNAS07A">{{cite journal |vauthors=Firestone RB, West A, Kennett JP, etal |title=Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling|journal=Proc. Natl. Acad. Sci. U.S.A.|volume=104|issue=41 |pages=16016–16021|date=October 2007|pmid=17901202 |pmc=1994902|doi=10.1073/pnas.0706977104 |bibcode=2007PNAS..10416016F|doi-access=free}}</ref><ref name=Bunch>{{cite journal |vauthors=Bunch TE, Hermes RE, Moore AM, Kennettd DJ, Weaver JC, Wittke JH, DeCarli PS, Bischoff JL, Hillman GC, Howard GA, Kimbel DR, Kletetschka G, Lipo CP, Sakai S, Revay Z, West A, Firestone RB, Kennett JP |title=Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=109 |issue=28|pages=E1903–12|date=June 2012|pmid=22711809|pmc=3396500 |doi=10.1073/pnas.1204453109 |bibcode=2012PNAS..109E1903B|doi-access=free}}</ref> Despite its popularity among nonscientists, this hypothesis never been accepted by relevant experts, who dismiss it as a fringe theory.<ref>{{cite journal |last1=Boslough |first1=Mark |date=March 2023 |title=Apocalypse! |url=https://www.skeptic.com/reading_room/graham-hancocks-ancient-apocalypse-hypothesis-put-to-test/ |journal=Skeptic Magazine |volume=28 |issue=1 |pages=51–59}}</ref>

==Contemporary extinction==
{{Further|Biodiversity loss|Human impact on the environment}}

===History===
[[File:Susa group, mountain gorilla.jpg|thumb|There are roughly 880 [[mountain gorillas]] remaining. 60% of [[primate]] species face an anthropogenically driven extinction crisis and 75% have declining populations.<ref name="primates"/>]]

Contemporary [[human overpopulation]]<ref name="Cafaro2022"/><ref>{{cite book|editor1-last=Crist|editor1-first=Eileen|editor2-last=Cafaro |editor2-first=Philip |date=2012|title=Life on the Brink: Environmentalists Confront Overpopulation|publisher=[[University of Georgia Press]]|page=83 |url=https://books.google.com/books?id=heOrAAAAQBAJ&pg=PA83 |isbn=978-0820343853}}</ref> and continued [[population growth]], along with per-capita [[Overconsumption|consumption]] growth, prominently in the past two centuries, are regarded as the underlying causes of extinction.<ref name="PimmJenkins"/><ref name=ceballos/><ref name=Ceballos-Ehrlich-2017-05>{{cite journal|last1=Ceballos|first1=Gerardo|last2=Ehrlich|first2=Paul R.|last3=Dirzo |first3=Rodolfo|date=23 May 2017|title=Biological annihilation via the ongoing sixth mass extinction signaled by vertebrate population losses and declines|journal=[[Proceedings of the National Academy of Sciences of the United States of America|PNAS]] |volume=114|issue=30|pages=E6089–E6096 |doi=10.1073/pnas.1704949114|quote=Much less frequently mentioned are, however, the ultimate drivers of those immediate causes of biotic destruction, namely, human overpopulation and continued population growth, and overconsumption, especially by the rich. These drivers, all of which trace to the fiction that perpetual growth can occur on a finite planet, are themselves increasing rapidly|pmc=5544311 |pmid=28696295|bibcode=2017PNAS..114E6089C |doi-access=free}}</ref><ref name="Stokstad"/><ref name="Bradshaw2021"/> [[Inger Andersen (environmentalist)|Inger Andersen]], the executive director of the [[United Nations Environment Programme]], stated that "we need to understand that the more people there are, the more we put the Earth under heavy pressure. As far as biodiversity is concerned, we are at war with nature."<ref>{{cite news |last=Greenfield|first=Patrick |date=December 6, 2022|title='We are at war with nature': UN environment chief warns of biodiversity apocalypse|url=https://www.theguardian.com/environment/2022/dec/06/cop-15-un-chief-biodiversity-apocalypse|work=The Guardian|location= |access-date=January 14, 2023|quote='We’ve just welcomed the 8 billionth member of the human race on this planet. That’s a wonderful birth of a baby, of course. But we need to understand that the more people there are, the more we put the Earth under heavy pressure. As far as biodiversity is concerned, we are at war with nature. We need to make peace with nature. Because nature is what sustains everything on Earth … the science is unequivocal.' - Inger Andersen}}</ref>

Some scholars assert that the emergence of [[capitalism]] as the dominant economic system has accelerated ecological exploitation and destruction,<ref name="Hickel">{{cite book|last=Hickel |first=Jason|author-link=Jason Hickel|title=Less is More: How Degrowth Will Save the World|year=2021 |publisher=Windmill Books|pages=39–40|isbn=978-1786091215|quote=It was only with the rise of capitalism over the past few hundred years, and the breathtaking acceleration of industrialization from the 1950s, that on a planetary scale things began to tip out of balance.}}</ref><ref>{{cite book |last=Foster |first=John Bellamy |author-link=John Bellamy Foster|date=2022 |title=Capitalism in the Anthropocene: Ecological Ruin or Ecological Revolution|url=https://books.google.com/books?id=wY5IEAAAQBAJ&pg=PT7 |publisher=[[Monthly Review Press]]|page=1 |isbn=978-1583679746|quote=The advent of the Anthropocene coincided with a planetary rift, as the human economy under capitalism heedlessly crossed, or began to cross, Earth System boundaries, fouling its own nest and threatening the destruction of the planet as a safe home for humanity.}}</ref><ref name=affluent/><ref>{{cite book |last1=Derber|first1=Charles |author-link1=Charles Derber|last2=Moodliar |first2=Suren |date=2023 |title=Dying for Capitalism: How Big Money Fuels Extinction and What We Can Do About It|url= |location= |publisher=[[Routledge]] |page= |isbn=978-1032512587}}</ref> and has also exacerbated mass species extinction.<ref name="Dawson">{{cite book|last=Dawson|first=Ashley|url=http://www.orbooks.com/catalog/extinction-by-ashley-dawson/|title=Extinction: A Radical History|date=2016|publisher=[[OR Books]]|isbn=978-1-944869-01-4|pages=41, 100–101|author-link=Ashley Dawson|access-date=2016-08-20|archive-date=2016-09-17|archive-url=https://web.archive.org/web/20160917203814/http://www.orbooks.com/catalog/extinction-by-ashley-dawson/|url-status=dead}}</ref> [[CUNY]] professor [[David Harvey]], for example, posits that the [[Neoliberalism|neoliberal]] era "happens to be the era of the fastest mass extinction of species in the Earth's recent history".<ref>{{Cite book |last=Harvey|first=David |url=https://global.oup.com/academic/product/a-brief-history-of-neoliberalism-9780199283279?cc=us&lang=en&|title=A Brief History of Neoliberalism|publisher=[[Oxford University Press]]|year=2005 |isbn=978-0199283279|page=173|author-link=David Harvey (geographer)}}</ref> Ecologist [[William E. Rees]] concludes that the "neoliberal paradigm contributes significantly to planetary unraveling" by treating the economy and the ecosphere as totally separate systems, and by neglecting the latter.<ref>{{cite journal |last1=Rees|first1=William E.|author-link=William E. Rees|date=2020 |title=Ecological economics for humanity's plague phase|url=http://www.fraw.org.uk/data/limits/rees_2020.pdf|journal=[[Ecological Economics (journal)|Ecological Economics]]|volume=169 |issue= |pages=106519 |doi=10.1016/j.ecolecon.2019.106519|s2cid=209502532 |access-date=}}</ref> Major lobbying organizations representing corporations in the agriculture, fisheries, forestry and paper, mining, and oil and gas industries, including the [[United States Chamber of Commerce]], have been pushing back against legislation that could address the extinction crisis. A 2022 report by the climate think tank InfluenceMap stated that "although industry associations, especially in the US, appear reluctant to discuss the biodiversity crisis, they are clearly engaged on a wide range of policies with significant impacts on biodiversity loss."<ref>{{cite news |last=Weston|first=Phoebe |date=October 24, 2022 |title=Business groups block action that could help tackle biodiversity crisis, report finds|url=https://www.theguardian.com/environment/2022/oct/24/business-groups-block-action-that-could-help-tackle-biodiversity-crisis-aoe|work=The Guardian |access-date=October 25, 2022}}</ref>

[[File:Giraffe koure niger 2006.jpg|left|thumb|As of 2023, [[giraffe]] populations have been driven to extinction in seven countries.<ref>{{cite news |author=<!--not stated-->  |date=July 5, 2023 |title=Why is the giraffe facing a silent extinction?|url=https://www.aljazeera.com/podcasts/2023/7/5/why-is-the-giraffe-facing-a-silent-extinction|work=[[Al Jazeera Media Network|Al Jazeera]] |location= |access-date=July 7, 2023}}</ref>]]

The loss of animal species from ecological communities, [[defaunation]], is primarily driven by human activity.<ref name="dirzo" /> This has resulted in [[empty forest]]s, ecological communities depleted of large vertebrates.<ref name="SpecialIssue" /><ref name="primack2014">{{Cite book|title=Essentials of Conservation Biology|last=Primack|first=Richard|publisher=Sinauer Associates, Inc. Publishers|year=2014 |isbn=978-1-605-35289-3 |location=Sunderland, MA|pages=217–245}}</ref> This is not to be confused with extinction, as it includes both the disappearance of species and declines in abundance.<ref>{{Cite web |title=Tracking and combatting our current mass extinction|website=Ars Technica|date=2014-07-25 |url=https://arstechnica.com/science/2014/07/tracking-and-combatting-our-current-mass-extinction/ |access-date=2015-11-30}}</ref> Defaunation effects were first implied at the Symposium of Plant-Animal Interactions at the University of Campinas, Brazil in 1988 in the context of [[Neotropical realm|Neotropical forests]].<ref name="eco and evo" /> Since then, the term has gained broader usage in conservation biology as a global phenomenon.<ref name="dirzo" /><ref name="eco and evo">{{cite journal |last1=Dirzo|first1=R.|last2=Galetti|first2=M.|year=2013|title=Ecological and Evolutionary Consequences of Living in a Defaunated World|doi=10.1016/j.biocon.2013.04.020|journal=[[Biological Conservation (journal)|Biological Conservation]]|volume=163|pages=1–6|bibcode=2013BCons.163....1G }}</ref>

[[Big cat]] populations have severely declined over the last half-century and could face extinction in the following decades. According to 2011 [[International Union for Conservation of Nature|IUCN]] estimates: [[lions]] are down to 25,000, from 450,000; [[leopards]] are down to 50,000, from 750,000; [[cheetahs]] are down to 12,000, from 45,000; [[tigers]] are down to 3,000 in the wild, from 50,000.<ref name="bigcats">{{cite web |url=https://www.usatoday.com/tech/science/environment/story/2011-10-28/lions-tigers-extinction/50958540/1 |title=Lions, tigers, big cats may face extinction in 20 years |first=Dan |last=Vergano |website=USA Today |date=October 28, 2011}}</ref> A December 2016 study by the Zoological Society of London, [[Panthera Corporation]] and [[Wildlife Conservation Society]] showed that cheetahs are far closer to extinction than previously thought, with only 7,100 remaining in the wild, existing within only 9% of their historic range.<ref name="Visser">{{cite web|url=http://www.huffingtonpost.com/entry/cheetahs-endangered-panthera-report_us_585c47d2e4b0eb586485d3e0?|title=Cheetahs Are Far Closer To Extinction Than We Realized|first= Nick|last=Visser|date=December 27, 2016|website=The Huffington Post|access-date=December 27, 2016}}</ref> Human pressures are to blame for the cheetah population crash, including prey loss due to overhunting by people, retaliatory killing from farmers, habitat loss and the illegal wildlife trade.<ref>{{cite journal|display-authors=20|first1=Sarah M. |last1=Duranta |first2=Nicholas |last2=Mitchell |first3=Rosemary |last3=Groom |first4=Nathalie |last4=Pettorelli |first5=Audrey |last5=Ipavec |first6=Andrew P. |last6=Jacobson |first7=Rosie |last7=Woodroffe |first8=Monika |last8=Böhm |first9=Luke T. B. |last9=Hunter |first10=Matthew S. |last10=Becker |first11=Femke |last11=Broekhuis |first12=Sultana |last12=Bashir |first13=Leah |last13=Andresen |first14=Ortwin |last14=Aschenborn |first15=Mohammed |last15=Beddiaf |first16=Farid |last16=Belbachir |first17=Amel |last17=Belbachir-Bazi |first18=Ali |last18=Berbash |first19=Iracelma |last19=Brandao de Matos Machado |first20=Christine |last20=Breitenmoser |first21=Monica |last21=Chege |first22=Deon |last22=Cilliers |first23=Harriet |last23=Davies-Mostert |first24=Amy J. |last24=Dickman |first25=Fabiano |last25=Ezekiel |first26=Mohammad S. |last26=Farhadinia |first27=Paul |last27=Funston |first28=Philipp |last28=Henschel |first29=Jane |last29=Horgan |first30=Hans H.|last30=de Iongh |first31=Houman |last31=Jowkar |first32=Rebecca |last32=Klein |first33=Peter Andrew |last33=Lindsey |first34=Laurie |last34=Marker |first35=Kelly |last35=Marnewick |first36=Joerg |last36=Melzheimera |first37=Johnathan |last37=Merkle |first38=Jassiel |last38=M'sokab |first39=Maurus |last39=Msuhac |first40=Helen |last40=O'Neill |first41=Megan |last41=Parker |first42=Gianetta |last42=Purchase |first43=Samaila |last43=Sahailou |first44=Yohanna |last44=Saidu |first45=Abdoulkarim |last45=Samna |first46=Anne |last46=Schmidt-Küntze |first47=Eda |last47=Selebatso |first48=Etotépé A. |last48=Sogbohossou |first49=Alaaeldin |last49=Soultan |first50=Emma |last50=Stone |first51=Esther |last51=van der Meer |first52=Rudie |last52=van Vuuren |first53=Mary |last53=Wykstra |first54=Kim |last54=Young-Overto |year=2016 |title=The global decline of cheetah ''Acinonyx jubatus'' and what it means for conservation|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=114|issue=3|pages=1–6 |doi=10.1073/pnas.1611122114|pmid=28028225|pmc=5255576|doi-access=free}}</ref> Populations of [[Brown bear|brown bears]] have  experienced similar population decline.<ref>{{Cite journal |last1=Albrecht |first1=Jörg |last2=Bartoń |first2=Kamil A. |last3=Selva |first3=Nuria |last4=Sommer |first4=Robert S. |last5=Swenson |first5=Jon E. |last6=Bischof |first6=Richard |date=4 September 2017 |title=Humans and climate change drove the Holocene decline of the brown bear |journal=[[Scientific Reports]] |language=en |volume=7 |issue=1 |pages=10399 |doi=10.1038/s41598-017-10772-6 |pmid=28871202 |issn=2045-2322 |pmc=5583342 |bibcode=2017NatSR...710399A }}</ref>

The term [[pollinator decline]] refers to the reduction in abundance of insect and other animal pollinators in many ecosystems worldwide beginning at the end of the twentieth century, and continuing into the present day.<ref>{{cite web |last1=Kluser |first1=S. |last2=Peduzzi |first2=P. |year=2007 |url=http://archive-ouverte.unige.ch/unige:32258/ATTACHMENT01 |title=Global pollinator decline: a literature review}}</ref> Pollinators, which are necessary for 75% of food crops, are declining globally in both abundance and diversity.<ref>{{cite journal|last=Dirzo|first=Rodolfo|author2=Young, Hillary S.|author3=Galetti, Mauro|author4=Ceballos, Gerardo|author5=Isaac, Nick J. B.|author6=Collen, Ben|title=Defaunation in the Anthropocene|journal=Science|date=2014|volume=345|issue=6195|pages=401–406 |doi=10.1126/science.1251817|pmid=25061202|bibcode=2014Sci...345..401D|s2cid=206555761 |url=http://www.uv.mx/personal/tcarmona/files/2010/08/Science-2014-Dirzo-401-6-2.pdf|access-date=December 16, 2016}}</ref> A 2017 study led by [[Radboud University Nijmegen|Radboud University's]] Hans de Kroon indicated that the biomass of insect life in Germany had declined by three-quarters in the previous 25 years.  Participating researcher Dave Goulson of [[Sussex University]] stated that their study suggested that humans are making large parts of the planet uninhabitable for wildlife. Goulson characterized the situation as an approaching "ecological Armageddon", adding that "if we lose the insects then everything is going to collapse."<ref>{{cite news |last=Carrington |first=Damian |url=https://www.theguardian.com/environment/2017/oct/18/warning-of-ecological-armageddon-after-dramatic-plunge-in-insect-numbers|title=Warning of 'ecological Armageddon' after dramatic plunge in insect numbers |newspaper=The Guardian|date=18 October 2017}}</ref> A 2019 study found that over 40% of insect species are threatened with extinction.<ref>{{cite journal |last1=Sánchez-Bayo |first1=Francisco |last2=Wyckhuys |first2=Kris A.G. |date=April 2019 |title=Worldwide decline of the entomofauna: A review of its drivers |journal=Biological Conservation |volume=232 |issue= |pages=8–27 |doi=10.1016/j.biocon.2019.01.020 |bibcode=2019BCons.232....8S |s2cid=91685233}}</ref> The most significant drivers in the [[Decline in insect populations|decline of insect populations]] are associated with [[intensive farming]] practices, along with pesticide use and climate change.<ref>{{cite news|last=Briggs |first=Helen|date=October 30, 2019|title='Alarming' loss of insects and spiders recorded |url=https://www.bbc.com/news/science-environment-50226367|work=BBC|access-date=November 2, 2019}}</ref> The world's insect population decreases by around 1 to 2% per year.<ref>{{cite news|last=Lewis|first=Sophie |date=January 12, 2021|title=Scientists warn the world's insects are undergoing "death by a thousand cuts" |url=https://www.cbsnews.com/news/insects-death-by-a-thousand-cuts/|work=[[CBS News]]|access-date=January 12, 2021}}</ref>

[[File:Ringtailed Lemurs in Berenty.jpg|left|thumb|The [[ring-tailed lemur]], one of the more than 120 unique species of mammals only found on [[Madagascar]] threatened with extinction.<ref>{{cite news |last= Weston|first=Phoebe|date=January 10, 2023 |title=Madagascar's unique wildlife faces imminent wave of extinction, say scientists|url=https://www.theguardian.com/environment/2023/jan/10/madagascar-unique-wildlife-extinction-aoe|work=The Guardian |location= |access-date=January 12, 2023}}</ref>]]

{{blockquote|text=We have driven the rate of biological extinction, the permanent loss of species, up several hundred times beyond its historical levels, and are threatened with the loss of a majority of all species by the end of the 21st century.|source=[[Peter H. Raven|Peter Raven]], former president of the [[American Association for the Advancement of Science]] (AAAS), in the foreword to their publication ''AAAS Atlas of Population and Environment''<ref>{{cite web|url=http://atlas.aaas.org/|title=Atlas of Population and Environment|publisher=[[American Association for the Advancement of Science|AAAS]] |year=2000|access-date=2008-02-12|url-status=dead |archive-url=https://web.archive.org/web/20110309092803/http://atlas.aaas.org/|archive-date=2011-03-09}}</ref>}}

[[File:Northern White Rhinoceros Angalifu.jpg|thumb|[[Angalifu (rhinoceros)|Angalifu]], a male [[northern white rhinoceros]] at the [[San Diego Zoo Safari Park]] (died December 2014).<ref>{{cite news|title=A northern white rhino has died. There are now five left in the entire world |url=https://www.washingtonpost.com/news/speaking-of-science/wp/2014/12/15/a-northern-white-rhino-has-died-there-are-now-five-left-in-the-entire-world/|newspaper=The Washington Post|date=15 December 2014}}</ref> [[Sudan (rhinoceros)|Sudan]], the last male of the subspecies died on March 19, 2018.<ref>{{cite news|url=https://www.bbc.com/news/world-africa-43468066|title=Northern white rhino: Last male Sudan dies in Kenya|date=March 20, 2018|work=British Broadcasting Corporation}}</ref>]]
Various species are predicted to [[List of critically endangered species|become extinct in the near future]],<ref>{{Cite web|author1=Douglas Main|date=2013-11-22|title=7 Iconic Animals Humans Are Driving to Extinction|url=https://www.livescience.com/41421-animals-threatened-with-extinction.html|access-date=2023-01-06|website=livescience.com|language=en}}</ref> among them some species of [[rhinoceros]],<ref>{{cite web|date=October 25, 2011|url=http://blogs.scientificamerican.com/extinction-countdown/2011/10/25/poachers-drive-javan-rhino-to-extinction-in-vietnam/|title=Poachers Drive Javan Rhino to Extinction in Vietnam [Updated]|first=John R.|last=Platt|work=Scientific American}}</ref><ref>{{cite news|last= Inus|first=Kristy|date=April 18, 2019 |title=Sumatran rhinos extinct in the wild |url=https://www.thestar.com.my/news/nation/2019/04/18/sumatran-rhinos-extinct-in-the-wild/|work=The Star Online|access-date=April 26, 2019}}</ref> [[Primate|primates]],<ref name="primates">{{cite journal |display-authors=20 |last1=Estrada |first1=Alejandro |last2=Garber |first2=Paul A. |last3=Rylands |first3=Anthony B. |last4=Roos |first4=Christian |last5=Fernandez-Duque |first5=Eduardo |last6=Di Fiore |first6=Anthony |last7=Anne-Isola Nekaris |first7=K. |last8=Nijman |first8=Vincent |last9=Heymann |first9=Eckhard W. |last10=Lambert |first10=Joanna E. |last11=Rovero |first11=Francesco |last12=Barelli |first12=Claudia |last13=Setchell |first13=Joanna M. |last14=Gillespie |first14=Thomas R. |last15=Mittermeier |first15=Russell A. |last16=Arregoitia |first16=Luis Verde |last17=de Guinea |first17=Miguel |last18=Gouveia |first18=Sidney |last19=Dobrovolski |first19=Ricardo |last20=Shanee |first20=Sam |last21=Shanee |first21=Noga |last22=Boyle |first22=Sarah A. |last23=Fuentes |first23=Agustin |last24=MacKinnon |first24=Katherine C. |last25=Amato |first25=Katherine R. |last26=Meyer |first26=Andreas L. S. |last27=Wich |first27=Serge |last28=Sussman |first28=Robert W. |last29=Pan |first29=Ruliang |last30=Kone |first30=Inza |last31=Li |first31=Baoguo |date=January 18, 2017|title=Impending extinction crisis of the world's primates: Why primates matter |journal=[[Science Advances]]|volume=3|issue=1|pages= e1600946|doi= 10.1126/sciadv.1600946|pmc=5242557 |pmid=28116351 |bibcode=2017SciA....3E0946E}}</ref> and [[Pangolin|pangolins]].<ref>{{cite news|website=The Telegraph |url=https://www.telegraph.co.uk/news/earth/wildlife/11370277/Pangolins-why-this-cute-prehistoric-mammal-is-facing-extinction.html|url-access=subscription|access-date=December 14, 2016|url-status=live|archive-url=https://ghostarchive.org/archive/20220111/https://www.telegraph.co.uk/news/earth/wildlife/11370277/Pangolins-why-this-cute-prehistoric-mammal-is-facing-extinction.html|archive-date=2022-01-11 |title=Pangolins: why this cute prehistoric mammal is facing extinction|first=Martin|last=Fletcher |date=January 31, 2015}}{{cbignore}}</ref> Others, including several species of [[giraffe]], are considered "[[Vulnerable species|vulnerable]]" and are experiencing significant population declines from anthropogenic impacts including hunting, deforestation and conflict.<ref>{{cite news|date=December 8, 2016 |title=Giraffes facing extinction after devastating decline, experts warn|newspaper=The Guardian |url=https://www.theguardian.com/environment/2016/dec/08/giraffe-red-list-vulnerable-species-extinction |first=Damian|last=Carrington|access-date=December 8, 2016}}</ref><ref name="suttergiraffe">{{cite news |last=Sutter |first=John D. |date=December 12, 2016|title=Imagine a world without giraffes|publisher=CNN |url=http://www.cnn.com/2016/12/08/world/sutter-giraffe-extinction/|access-date=2022-11-10}}</ref> [[Hunting]] alone threatens bird and mammalian populations around the world.<ref>{{cite web|url= https://www.science.org/content/article/people-are-hunting-primates-bats-and-other-mammals-extinction |title=People are hunting primates, bats, and other mammals to extinction|first=Elizabeth|last=Pennisi |author-link=Elizabeth Pennisi|date=October 18, 2016|website=[[Science (magazine)|Science]]|access-date=November 21, 2016}}</ref><ref>{{cite journal|first1=William J.|last1=Ripple|first2=Katharine |last2=Abernethy|first3=Matthew G. |last3=Betts |first4=Guillaume |last4=Chapron |first5=Rodolfo |last5=Dirzo |first6=Mauro |last6=Galetti |first7=Taal |last7=Levi |first8=Peter A. |last8=Lindsey |first9=David W. |last9=Macdonald |first10=Brian |last10=Machovina |first11=Thomas M. |last11=Newsome |first12=Carlos A. |last12=Peres |first13=Arian D. |last13=Wallach |first14=Christopher |last14=Wolf |first15=Hillary |last15=Young |year=2016 |title=Bushmeat hunting and extinction risk to the world's mammals |journal=Royal Society Open Science|volume=3|issue=10|pages=1–16 |doi=10.1098/rsos.160498 |pmid=27853564 |pmc=5098989 |bibcode=2016RSOS....360498R}}</ref><ref>{{cite journal |last1=Benítez-López |first1=A.|last2=Alkemade |first2=R.|last3=Schipper|first3=A. M.|last4=Ingram|first4=D. J.|last5=Verweij |first5=P. A.|last6=Eikelboom |first6=J. A. J.|last7= Huijbregts|first7=M. A. J. |date=April 14, 2017 |title=The impact of hunting on tropical mammal and bird populations|journal=Science|volume=356 |issue=6334|pages=180–183 |doi=10.1126/science.aaj1891 |pmid=28408600|bibcode=2017Sci...356..180B |hdl=1874/349694 |s2cid=19603093 |url=http://discovery.ucl.ac.uk/10058583/|hdl-access=free}}</ref> The direct killing of [[megafauna]] for meat and body parts is the primary driver of their destruction, with 70% of the 362 megafauna species in decline as of 2019.<ref>{{cite news|last= Milman|first=Oliver|date=February 6, 2019 |title=The killing of large species is pushing them towards extinction, study finds |url=https://www.theguardian.com/world/2019/feb/06/the-killing-of-large-species-is-pushing-them-towards-extinction-study-finds|work=The Guardian|access-date=February 8, 2019}}</ref><ref>{{cite journal |last1=Ripple |first1=William J. |last2=Wolf |first2=Christopher |last3=Newsome |first3=Thomas M. |last4=Betts |first4=Matthew G. |last5=Ceballos |first5=Gerardo |last6=Courchamp |first6=Franck |last7=Hayward |first7=Matt W. |last8=Van Valkenburgh |first8=Blaire |last9=Wallach |first9=Arian D. |last10=Worm |first10=Boris |year=2019|title=Are we eating the world's megafauna to extinction?|journal=Conservation Letters|volume=12|issue=3|at=e12627 |doi=10.1111/conl.12627|doi-access=free|bibcode=2019ConL...12E2627R }}</ref> Mammals in particular have suffered such severe losses as the result of human activity (mainly during the [[Quaternary extinction event]], but partly during the Holocene) that it could take several million years for them to recover.<ref>{{cite news|last=Wilcox |first=Christie |date=October 17, 2018|title=Human-caused extinctions have set mammals back millions of years |url=https://www.nationalgeographic.com/animals/article/millions-of-years-mammal-evolution-lost-news?user.testname=none|archive-url=https://web.archive.org/web/20210507003831/https://www.nationalgeographic.com/animals/article/millions-of-years-mammal-evolution-lost-news?user.testname=none|url-status=dead|archive-date=May 7, 2021|work=National Geographic|access-date=March 14, 2022}}</ref><ref>{{cite news |last=Yong |first=Ed |date=October 15, 2018|title=It Will Take Millions of Years for Mammals to Recover From Us |url=https://www.theatlantic.com/science/archive/2018/10/mammals-will-need-millions-years-recover-us/573031/|work=[[The Atlantic]] |access-date=November 1, 2018}}</ref> Contemporary assessments have discovered that roughly 41% of amphibians, 25% of mammals, 21% of reptiles and 14% of birds are threatened with extinction, which could disrupt ecosystems on a global scale and eliminate billions of years of [[phylogenetic diversity]].<ref>{{cite news |last=Green |first=Graeme |date=April 27, 2022 |title=One in five reptiles faces extinction in what would be a 'devastating' blow |work=The Guardian |url=https://www.theguardian.com/environment/2022/apr/27/one-in-five-reptiles-face-extinction-in-devastating-blow-to-biodiversity-aoe |access-date=May 2, 2022}}</ref><ref>{{cite journal |last1=Cox |first1=Neil |last2=Young |first2=Bruce E. |display-authors=etal. |date=2022 |title=A global reptile assessment highlights shared conservation needs of tetrapods |journal=Nature |volume=605 |issue=7909 |pages=285–290 |doi=10.1038/s41586-022-04664-7 |doi-access=free|pmid=35477765|pmc=9095493|bibcode=2022Natur.605..285C }}</ref> 189 countries, which are signatory to the [[Convention on Biological Diversity]] (Rio Accord),<ref>{{cite web |url=https://www.cbd.int/history/|title=History of the Convention|publisher=Secretariat of the Convention on Biological Diversity|access-date=9 January 2017}}</ref> have committed to preparing a [[Biodiversity Action Plan]], a first step at identifying specific [[endangered species]] and habitats, country by country{{Update inline|date=March 2022}}.<ref>{{cite book|last1=Glowka|first1=Lyle |first2=Françoise|last2=Burhenne-Guilmin|first3=Hugh |last3=Synge|first4=Jeffrey A.|last4=McNeely |first5=Lothar|last5=Gündling|title=IUCN environmental policy and law paper |series=Guide to the Convention on Biodiversity|year=1994|publisher=International Union for Conservation of Nature |isbn=978-2-8317-0222-3}}</ref>
{{blockquote|text=For the first time since the demise of the dinosaurs 65 million years ago, we face a global mass extinction of wildlife. We ignore the decline of other species at our peril – for they are the barometer that reveals our impact on the world that sustains us.|source=Mike Barrett, director of science and policy at WWF's UK branch<ref>{{cite news|url=http://www.aljazeera.com/news/2016/10/60-percent-global-wildlife-species-wiped-161027151043413.html|title=60 percent of global wildlife species wiped out|publisher=[[Al Jazeera Media Network|Al Jazeera]]|date=28 October 2016|access-date=9 January 2017}}</ref>}}

A 2023 study published in ''[[Current Biology]]'' concluded that current biodiversity loss rates could reach a tipping point and inevitably trigger a total ecosystem collapse.<ref>{{cite news |last=Carrington|first=Damian |date=February 24, 2023 |title=Ecosystem collapse 'inevitable' unless wildlife losses reversed|url=https://www.theguardian.com/environment/2023/feb/24/ecosystem-collapse-wildlife-losses-permian-triassic-mass-extinction-study|work=The Guardian |location= |access-date=February 25, 2023|quote=The researchers concluded: 'A biodiversity crash may be the harbinger of a more devastating ecosystem collapse.'}}</ref>

===Recent extinction===
{{See also|IUCN Red List extinct in the wild species|List of endangered species|List of critically endangered species}}
[[File:Share of species threatened with extinction, OWID.svg|thumb|Share of species threatened with extinction as of 2019.]]
Recent extinctions are more directly attributable to human influences, whereas prehistoric extinctions can be attributed to other factors, such as global climate change.<ref name=dirzo/><ref name=ceballos/> The [[International Union for Conservation of Nature]] (IUCN) characterizes 'recent' extinction as those that have occurred past the cut-off point of 1500,<ref>{{cite journal|first1=Diana O.|last1=Fisher |first2=Simon P. |last2=Blomberg|year=2011|title=Correlates of rediscovery and the detectability of extinction in mammals|journal=Proceedings of the Royal Society B: Biological Sciences|volume=278 |issue=1708|pages=1090–1097 |doi=10.1098/rspb.2010.1579|pmc=3049027|pmid=20880890}}</ref> and at least 875 plant and animal species have gone extinct since that time and 2009.<ref>{{cite web |title=Extinction continues apace|url=http://www.iucn.org/?4143/Extinction-crisis-continues-apace |publisher=International Union for Conservation of Nature|date=3 November 2009|access-date=18 October 2012}}</ref> Some species, such as the [[Père David's deer]]<ref>{{cite iucn |author=Jiang, Z. |author2=Harris, R.B.|date=2016|title=''Elaphurus davidianus''|volume=2016|page=e.T7121A22159785 |doi=10.2305/IUCN.UK.2016-2.RLTS.T7121A22159785.en|access-date=12 November 2021}}</ref> and the [[Hawaiian crow]],<ref name=IUCN>{{cite iucn|author=BirdLife International|date=2016|title=''Corvus hawaiiensis''|volume=2016|page=e.T22706052A94048187|doi=10.2305/IUCN.UK.2016-3.RLTS.T22706052A94048187.en}}</ref> are extinct in the wild, and survive solely in captive populations. Other populations are only [[Local extinction|locally extinct]] (extirpated), still existent elsewhere, but reduced in distribution,<ref name=mckinney2013>{{cite book|chapter-url={{Google books|plainurl=yes|id=hBntufCOxAsC|page=318}}|first1=Michael L.|last1=McKinney |first2=Robert|last2=Schoch|first3=Logan|last3=Yonavjak|year=2013|title=Environmental Science: Systems and Solutions|edition=5th |chapter=Conserving Biological Resources|publisher=Jones & Bartlett Learning |isbn=978-1-4496-6139-7|url=https://archive.org/details/environmentalsci0000mcki_y4n3|url-access=registration}}</ref>{{rp|75–77}} as with the extinction of [[gray whale]]s in the [[Atlantic Ocean|Atlantic]],<ref>{{Cite book|title=Encyclopedia of marine mammals|page=404|year=2009 |publisher=Academic Press|isbn=978-0-12-373553-9 |author1=Perrin, William F. |author2=Würsig, Bernd G. |author3-link=JGM "Hans" Thewissen|author3=JGM "Hans" Thewissen}}</ref> and of the [[leatherback sea turtle]] in Malaysia.<ref>{{cite book|first1=James R.|last1=Spotila |first2=Pilar S.|last2=Tomillo |year=2015|title=The Leatherback Turtle: Biology and Conservation|publisher=Johns Hopkins University |page=210|isbn=978-1-4214-1708-0|url={{Google books|plainurl=yes|id=3Vu8CgAAQBAJ|page=210}}}}</ref>

Since the Late Pleistocene, humans (together with other factors) have been rapidly driving the largest vertebrate animals towards extinction, and in the process interrupting a 66-million-year-old feature of ecosystems, the relationship between diet and body mass, which researchers suggest could have unpredictable consequences.<ref>{{cite news |last=Druker |first=Simon |date=April 21, 2022|title=Study: Humans interrupting 66-million-year-old relationship among animals |work=UPI |url=https://www.upi.com/Science_News/2022/04/21/humans-interupting-66-million-year-relationship-eliminating-large-animals/7651650562988/ |access-date=April 24, 2022}}</ref><ref>{{cite journal |last1=Cooke |first1=Rob |last2=Gearty |first2=William |display-authors=etal.|date=2022 |title=Anthropogenic disruptions to longstanding patterns of trophic-size structure in vertebrates |journal=Nature Ecology & Evolution |volume=6|issue=6 |pages=684–692|doi=10.1038/s41559-022-01726-x |pmid=35449460 |bibcode=2022NatEE...6..684C |s2cid=248323833|url=https://discovery.ucl.ac.uk/id/eprint/10148482/ }}</ref> A 2019 study published in ''[[Nature Communications]]'' found that rapid biodiversity loss is impacting larger mammals and birds to a much greater extent than smaller ones, with the body mass of such animals expected to shrink by 25% over the next century. Another 2019 study published in ''[[Biology Letters]]'' found that extinction rates are perhaps much higher than previously estimated, in particular for bird species.<ref>{{cite web|last=Mooers|first=Arne|date=January 16, 2020|url=https://theconversation.com/bird-species-are-facing-extinction-hundreds-of-times-faster-than-previously-thought-129134 |title=Bird species are facing extinction hundreds of times faster than previously thought|website=[[The Conversation (website)|The Conversation]]|access-date=January 18, 2020}}</ref>

The 2019 ''[[Global Assessment Report on Biodiversity and Ecosystem Services]]'' lists the primary causes of contemporary extinctions in descending order: (1) changes in land and sea use (primarily agriculture and overfishing respectively); (2) direct exploitation of organisms such as hunting; (3) anthropogenic climate change; (4) pollution and (5) invasive alien species spread by human trade.<ref name="Stokstad"/> This report, along with the 2020 ''[[Living Planet Report]]'' by the WWF, both project that climate change will be the leading cause in the next several decades.<ref name="Stokstad"/><ref name="Lewis2020"/>

A June 2020 study published in ''[[PNAS]]'' posits that the contemporary extinction crisis "may be the most serious environmental threat to the persistence of civilization, because it is irreversible" and that its acceleration "is certain because of the still fast growth in human numbers and consumption rates." The study found that more than 500 [[vertebrate]] species are poised to be lost in the next two decades.<ref name="Ceballos2020">{{cite journal|last1=Ceballos|first1=Gerardo|last2=Ehrlich|first2=Paul R.|last3= Raven|first3=Peter H.|date=June 1, 2020|title=Vertebrates on the brink as indicators of biological annihilation and the sixth mass extinction|journal=[[PNAS]]|volume=117|issue=24|pages=13596–13602|doi=10.1073/pnas.1922686117|doi-access=free|pmid=32482862|pmc=7306750|bibcode=2020PNAS..11713596C}}</ref>

===Habitat destruction===
{{See also|Habitat destruction|Deforestation|Environmental impact of agriculture|}}
{{Pie chart
|caption='''[[Biomass (ecology)|Biomass]] of [[mammal]]s on [[Earth]] as of 2018'''<ref name="Carrington2018"/><ref name="Biomass2018"/> 
|label1 =[[Livestock]], mostly [[cattle]] and [[pig]]s
|value1 =60|color1=blue
|label2 =[[Human]]s
|value2 =36|color2=red
|label3 =[[Wildlife|Wild mammals]]
|value3 =4|color3=green
}}Humans both create and destroy [[Crop cultivation|crop cultivar]] and [[domesticated animal]] varieties. Advances in transportation and [[industrial farming]] has led to [[monoculture]] and the extinction of many cultivars. The use of certain plants and animals for food has also resulted in their extinction, including [[Silphium (antiquity)|silphium]] and the [[passenger pigeon]].<ref>{{cite news |last=Torres|first=Luisa|date=September 23, 2019 |title=When We Love Our Food So Much That It Goes Extinct|work=[[NPR]]|url=https://www.npr.org/sections/thesalt/2019/09/23/763404243/when-we-love-our-food-so-much-that-it-goes-extinct|access-date=October 10, 2019}}</ref> It was estimated in 2012 that 13% of Earth's ice-free land surface is used as row-crop agricultural sites, 26% used as pastures, and 4% urban-industrial areas.<ref>{{cite journal|last1=Hooke|first1=R. LeB. |last2=Martin-Duque|first2=J. F.|last3=Pedraza|first3=J.|year=2012|title=Land transformation by humans: A review|journal=GSA Today|volume=22 |issue=12|pages=4–10|doi=10.1130/GSAT151A.1|bibcode=2012GSAT...12l...4H |s2cid=120172847|url=https://eprints.ucm.es/id/eprint/20528/1/Hooke_et_al_2012_GSAToday.pdf }}</ref>

In March 2019, ''[[Nature Climate Change]]'' published a study by ecologists from [[Yale University]], who found that over the next half century, human land use will reduce the habitats of 1,700 species by up to 50%, pushing them closer to extinction.<ref>{{cite news|last=Reints|first=Renae|date=March 6, 2019|title=1,700 Species Will Likely Go Extinct Due to Human Land Use, Study Says|work=[[Fortune (magazine)|Fortune]] |url=http://fortune.com/2019/03/06/human-land-use-study|access-date=March 11, 2019}}</ref><ref>{{cite journal|last1=Walter Jetz|last2=Powers|first2=Ryan P.|date=4 March 2019|title=Global habitat loss and extinction risk of terrestrial vertebrates under future land-use-change scenarios |journal=Nature Climate Change|volume=9|issue=4|pages=323–329|bibcode=2019NatCC...9..323P |doi=10.1038/s41558-019-0406-z|s2cid=92315899}}</ref> That same month ''[[PLOS Biology]]'' published a similar study drawing on work at the [[University of Queensland]], which found that "more than 1,200 species globally face threats to their survival in more than 90% of their habitat and will almost certainly face extinction without conservation intervention".<ref>{{cite web|last=Cox|first=Lisa|date=12 March 2019|title='Almost certain extinction': 1,200 species under severe threat across world |url=https://www.theguardian.com/environment/2019/mar/13/almost-certain-extinction-1200-species-under-severe-threat-across-world|access-date=13 March 2019|website=The Guardian}}</ref><ref>{{cite journal |last1=Venter |first1=Oscar|last2=Atkinson|first2=Scott C.|last3=Possingham|first3=Hugh P. |last4=O’Bryan|first4=Christopher J.|last5=Marco|first5=Moreno Di|last6=Watson|first6=James E. M. |last7=Allan|first7=James R.|date=12 March 2019 |title=Hotspots of human impact on threatened terrestrial vertebrates|journal=PLOS Biology|volume=17|issue=3|pages=e3000158|pmc=6413901|pmid=30860989 |doi=10.1371/journal.pbio.3000158 |doi-access=free }}</ref>

Since 1970, the populations of [[Fish migration|migratory]] freshwater fish have declined by 76%, according to research published by the [[Zoological Society of London]] in July 2020. Overall, around one in three freshwater fish species are threatened with extinction due to human-driven habitat degradation and overfishing.<ref>{{cite news|author=<!--Staff writer(s); no by-line.-->|date=July 28, 2020|title=Migratory river fish populations down 76% since 1970: study|work=[[Agence France-Presse]]|url=https://news.yahoo.com/migratory-river-fish-populations-down-76-since-1970-163127702.html|access-date=July 28, 2020}}</ref>

[[File:Malayasia iko 2002169.jpg|thumb|upright=1.15|right|Satellite image of rainforest converted to [[oil palm]] plantations.<ref>{{cite web|url= http://earthobservatory.nasa.gov/IOTD/view.php?id=40139 |title=Deforestation in Malaysian Borneo|year= 2009|publisher= NASA|access-date=7 April 2010}}</ref>]]
Some scientists and academics assert that [[Intensive animal farming|industrial agriculture]] and the growing demand for [[Environmental impact of meat production|meat]] is contributing to significant global [[biodiversity loss]] as this is a significant driver of [[deforestation]] and habitat destruction; species-rich habitats, such as the [[Deforestation of the Amazon rainforest|Amazon region]] and [[Deforestation in Indonesia|Indonesia]]<ref name="Foster">{{cite news|title=A Grim Portrait of Palm Oil Emissions|last1=Foster|first1=Joanna M.|url=http://green.blogs.nytimes.com/2012/05/01/a-grim-portrait-of-palm-oil-emissions/|newspaper=The New York Times|date=1 May 2012|access-date=10 January 2017}}</ref><ref name="Rosenthal NYT">{{cite news|title=Once a Dream Fuel, Palm Oil May Be an Eco-Nightmare|last1=Rosenthal|first1=Elisabeth|date=31 January 2007|newspaper=The New York Times |url=https://www.nytimes.com/2007/01/31/business/worldbusiness/31biofuel.html?pagewanted=1&ei=5088&en=e653a375e67e8e49&ex=1327899600&partner=rssnyt&emc=rss&_r=0|access-date=10 January 2017}}</ref> being converted to agriculture.<ref name="Zalasiewicz2015" /><ref>{{cite web|url= https://www.science.org/content/article/meat-eaters-may-speed-worldwide-species-extinction-study-warns |title=Meat-eaters may speed worldwide species extinction, study warns|first=Virginia|last=Morell |date=August 11, 2015|website=[[Science (magazine)|Science]]|access-date=December 14, 2016}}</ref><ref name="Machovina">{{cite journal |first1=B.|last1=Machovina|first2=K. J. |last2=Feeley|first3=W. J.|last3=Ripple|year=2015|title=Biodiversity conservation: The key is reducing meat consumption|journal=[[Science of the Total Environment]]|volume=536|pages=419–431|doi=10.1016/j.scitotenv.2015.07.022 |pmid=26231772|bibcode=2015ScTEn.536..419M}}</ref><ref>{{cite news|last= Johnston|first=Ian|date= August 26, 2017|title=Industrial farming is driving the sixth mass extinction of life on Earth, says leading academic |url=https://www.independent.co.uk/environment/mass-extinction-life-on-earth-farming-industrial-agriculture-professor-raj-patel-a7914616.html|work=[[The Independent]]|access-date=September 4, 2017}}</ref><ref>{{cite news |last=Devlin|first=Hannah|date=July 19, 2018|title=Rising global meat consumption 'will devastate environment'|url=https://www.theguardian.com/environment/2018/jul/19/rising-global-meat-consumption-will-devastate-environment |work=The Guardian|access-date=July 22, 2018}}</ref> A 2017 study by the [[World Wildlife Fund]] (WWF) found that 60% of biodiversity loss can be attributed to the vast scale of feed crop cultivation required to rear tens of billions of farm animals.<ref name="Smithers">{{cite news|last= Smithers|first=Rebecca|date=5 October 2017|title=Vast animal-feed crops to satisfy our meat needs are destroying planet |url=https://www.theguardian.com/environment/2017/oct/05/vast-animal-feed-crops-meat-needs-destroying-planet|work=The Guardian|access-date=5 October 2017}}</ref> Moreover, a 2006 report by the [[Food and Agriculture Organization]] (FAO) of the [[United Nations]], ''[[Livestock's Long Shadow]]'', also found that the livestock sector is a "leading player" in biodiversity loss.<ref>{{cite book|last1= Steinfeld|first1=Henning|last2=Gerber |first2=Pierre|last3= Wassenaar|first3=Tom|last4= Castel|first4=Vincent|last5= Rosales|first5=Mauricio|last6= de Haan|first6=Cees|date= 2006|title= Livestock's Long Shadow: Environmental Issues and Options |url=http://www.europarl.europa.eu/climatechange/doc/FAO%20report%20executive%20summary.pdf|publisher= [[Food and Agriculture Organization]]|isbn=978-92-5-105571-7|page=xxiii}}</ref> More recently, in 2019, the [[IPBES]] ''[[Global Assessment Report on Biodiversity and Ecosystem Services]]'' attributed much of this ecological destruction to agriculture and fishing, with the meat and dairy industries having a very significant impact.<ref name="BBCIPBES2019">{{Cite news|url=https://www.bbc.com/news/science-environment-48169783|title=Humans 'threaten 1m species with extinction'|last=McGrath|first=Matt|work=[[BBC]]|date=6 May 2019|access-date=3 August 2021|quote=Pushing all this forward, though, are increased demands for food from a growing global population and specifically our growing appetite for meat and fish.}}</ref> Since the 1970s food production has soared in order to feed a growing human population and bolster [[economic growth]], but at a huge price to the environment and other species. The report says some 25% of the Earth's ice-free land is used for cattle grazing.<ref name="Watts2019">{{cite news|last= Watts|first=Jonathan|date=May 6, 2019|title=Human society under urgent threat from loss of Earth's natural life|url=https://www.theguardian.com/environment/2019/may/06/human-society-under-urgent-threat-loss-earth-natural-life-un-report|work=The Guardian|access-date=May 16, 2019}}</ref> A 2020 study published in ''[[Nature Communications]]'' warned that human impacts from housing, industrial agriculture and in particular meat consumption are wiping out a combined 50 billion years of Earth's evolutionary history (defined as phylogenetic diversity{{efn|Phylogenetic diversity (PD) is the sum of the phylogenetic branch lengths in years connecting a set of species to each other across their phylogenetic tree, and measures their collective contribution to the tree of life.}}) and driving to extinction some of the "most unique animals on the planet," among them the [[Aye-aye]] lemur, the [[Chinese crocodile lizard]] and the [[pangolin]].<ref name="Woodyatt" /><ref>{{cite news|last=Briggs |first=Helen|date=May 26, 2020|title='Billions of years of evolutionary history' under threat |url=https://www.bbc.com/news/science-environment-52808103|work=BBC|access-date=October 5, 2020 |quote=The researchers calculated the amount of evolutionary history - branches on the tree of life - that are currently threatened with extinction, using extinction risk data for more than 25,000 species. They found a combined 50 billion years of evolutionary heritage, at least, were under threat from human impacts such as urban development, deforestation and road building.}}</ref> Said lead author Rikki Gumbs:

{{blockquote|text=We know from all the data we have for threatened species, that the biggest threats are agriculture expansion and the global demand for meat. Pasture land, and the clearing of rainforests for production of soy, for me, are the largest drivers – and the direct consumption of animals.<ref name="Woodyatt">{{cite news|last= Woodyatt|first=Amy|date=May 26, 2020|title=Human activity threatens billions of years of evolutionary history, researchers warn|url=https://www.cnn.com/2020/05/26/world/species-loss-evolution-climate-scn-intl-scli/index.html|work=[[CNN]]|access-date=May 27, 2020}}</ref>|author=|title=|source=}}

Urbanization has also been cited as a significant driver of biodiversity loss, particularly of plant life. A 1999 study of local plant extirpations in Great Britain found that urbanization contributed at least as much to local plant extinction as did agriculture.<ref>{{cite journal |last1=Thompson |first1=Ken |last2=Jones |first2=Allan |date=February 1999 |title=Human Population Density and Prediction of Local Plant Extinction in Britain |url=https://www.jstor.org/stable/2641578 |journal=Conservation Biology |volume=13 |issue=1 |pages=185–189 |doi=10.1046/j.1523-1739.1999.97353.x |jstor=2641578 |bibcode=1999ConBi..13..185T |s2cid=84308784 |access-date=6 January 2023}}</ref>

=== Climate change ===
{{Main|Extinction risk from climate change|Ocean acidification}}
[[File:Bramble-cay-melomys.jpg|thumb|upright=1.15|[[Bramble Cay melomys]] were declared extinct in June 2016. This is the first recorded mammalian extinction due to [[Human impact on the environment|anthropogenic]] climate change.<ref>{{cite news|last=Slezak|first=Michael|date=14 June 2016|title=Revealed: first mammal species wiped out by human-induced climate change|newspaper=The Guardian|location=London |url=https://www.theguardian.com/environment/2016/jun/14/first-case-emerges-of-mammal-species-wiped-out-by-human-induced-climate-change|access-date=16 November 2016}}</ref> ]]
[[Climate change]] is expected to be a major [[Extinction risk from climate change|driver of extinctions]] from the 21st century.<ref name="Stokstad" /> Rising levels of carbon dioxide are resulting in influx of this gas into the ocean, increasing its acidity. Marine organisms which possess [[seashell|calcium carbonate shells]] or [[exoskeleton]]s experience physiological pressure as the carbonate reacts with acid. For example, this is already resulting in [[coral bleaching]] on various [[coral reef]]s worldwide, which provide valuable habitat and maintain a high biodiversity.<ref>{{cite journal |last1=Chen |first1=Xuefei |last2=D'Olivo |first2=Juan Pablo |last3=Wei |first3=Gangjian |last4=McCulloch |first4=Malcolm |date=15 August 2019 |title=Anthropogenic ocean warming and acidification recorded by Sr/Ca, Li/Mg, δ11B and B/Ca in Porites coral from the Kimberley region of northwestern Australia |url=https://www.sciencedirect.com/science/article/abs/pii/S0031018219301816 |journal=[[Palaeogeography, Palaeoclimatology, Palaeoecology]] |volume=528 |pages=50–59 |doi=10.1016/j.palaeo.2019.04.033 |bibcode=2019PPP...528...50C |s2cid=155148474 |access-date=26 December 2022}}</ref> Marine [[Gastropoda|gastropods]], [[Bivalvia|bivalves]], and other invertebrates are also affected, as are the organisms that feed on them.<ref>{{Cite web|date=2017-03-07|title=Plastics in the Ocean|website=Ocean Conservancy |url=https://oceanconservancy.org/trash-free-seas/plastics-in-the-ocean/|access-date=2021-02-06}}</ref>{{Better source needed|reason=oceanconservancy.org is insufficiently reliable ([[WP:NOTRS]]).|date=May 2022}} Some studies have suggested that it is not climate change that is driving the current extinction crisis, but the demands of contemporary human civilization on nature.<ref>{{cite news |last=Ketcham|first= Christopher |date=December 3, 2022 |title=Addressing Climate Change Will Not "Save the Planet"|url=https://theintercept.com/2022/12/03/climate-biodiversity-green-energy/|work=[[The Intercept]]|location= |access-date=December 6, 2022|quote=When it comes to effects on wildlife, climate change is more like a mule, slow and plodding. Yes, a warmed atmosphere is projected to be a significant factor in the extinction crisis in future decades, but what’s destroying species today is habitat fragmentation and loss, overhunting and overexploitation, agricultural expansion, pollution, and industrial development. It isn’t climate change that caused a 69 percent loss in total wildlife populations between 1970 and 2018, according to a World Wildlife Fund study published this year. The cause is too many people demanding too much from ecosystems, or human overshoot of the biophysical carrying capacity of the Earth.}}</ref><ref>{{cite journal |last1=Caro|first1=Tim |last2=Rowe|first2=Zeke |display-authors=etal.|date=2022 |title=An inconvenient misconception: Climate change is not the principal driver of biodiversity loss|journal=[[Conservation Letters]]|volume= 15|issue=3|pages=e12868|doi=10.1111/conl.12868|s2cid=246172852 |doi-access=free|bibcode=2022ConL...15E2868C }}</ref> However, a rise in average global temperatures greater than 5.2 °C is projected to cause a mass extinction similar to the "Big Five" mass extinction events of the Phanerozoic, even without other anthropogenic impacts on biodiversity.<ref>{{cite journal |last1=Song |first1=Haijun |last2=Kemp |first2=David B. |last3=Tian |first3=Li |last4=Chu |first4=Daoliang |last5=Song |first5=Huyue |last6=Dai |first6=Xu |date=4 August 2021 |title=Thresholds of temperature change for mass extinctions |journal=[[Nature Communications]] |volume=12 |issue=1 |page=4694 |doi=10.1038/s41467-021-25019-2 |pmid=34349121 |pmc=8338942 |bibcode=2021NatCo..12.4694S }}</ref>

===Overexploitation===
{{See also|Species affected by poaching|Overfishing}}
[[File:Vaquita4 Olson NOAA.jpg|thumb|upright=1.15|The [[vaquita]], the world's most endangered marine mammal, was reduced to 30 individuals as of February 2017. They are often killed by commercial fishing nets.<ref>{{cite news|first=Virginia|last=Morell|title=World's most endangered marine mammal down to 30 individuals|url=https://www.science.org/content/article/world-s-most-endangered-marine-mammal-down-30-individuals|work=[[Science (magazine)|Science]]|date=February 1, 2017|access-date=February 3, 2017}}</ref> As of March 2019, only 10 remain, according to The International Committee for the Recovery of the Vaquita.<ref>{{cite news|date= March 15, 2019|title=World's most endangered marine mammal is now down to 10 animals|url=https://www.newscientist.com/article/2196694-worlds-most-endangered-marine-mammal-is-now-down-to-10-animals/|work=New Scientist|access-date=March 16, 2019}}</ref>]]
[[File:Northwest Atlantic cod biomass.svg|thumb|upright=1.15|left|The [[collapse of the Atlantic northwest cod fishery]] as a result of [[overfishing]], and subsequent recovery.]]
Overhunting can reduce the local population of [[game (hunting)|game animals]] by more than half, as well as reducing population density, and may lead to extinction for some species.<ref>{{cite journal |last=Redford|first=K. H.|year=1992|title=The empty forest|journal=BioScience|volume=42|issue=6 |pages=412–422|url=http://www.dse.ufpb.br/alexandre/Redford%201992%20-The%20empty%20forest.pdf |doi=10.2307/1311860|jstor=1311860}}</ref> Populations located nearer to villages are significantly more at risk of depletion.<ref name=peres2006>{{cite book|last1=Peres|first1=Carlos A.|first2=Hilton S.|last2=Nascimento|title=Human Exploitation and Biodiversity Conservation |chapter=Impact of Game Hunting by the Kayapo´ of South-eastern Amazonia: Implications for Wildlife Conservation in Tropical Forest Indigenous Reserves|series=Topics in Biodiversity and Conservation|volume=3|issue=8|year=2006 |pages=287–313|isbn=978-1-4020-5283-5}}</ref><ref>{{cite journal|last1=Altrichter|first1=M. |last2=Boaglio|first2=G.|title=Distribution and Relative Abundance of Peccaries in the Argentine Chaco: Associations with Human Factors|journal=Biological Conservation|volume=116|issue=2|year=2004|pages=217–225|doi=10.1016/S0006-3207(03)00192-7|bibcode=2004BCons.116..217A }}</ref> Several conservationist organizations, among them [[IFAW]] and [[HSUS]], assert that [[Trophy hunting|trophy hunters]], particularly from the United States, are playing a significant role in the decline of giraffes, which they refer to as a "silent extinction".<ref>{{cite news|last= Milman|first=Oliver|date=April 19, 2017|title=Giraffes must be listed as endangered, conservationists formally tell US|url=https://www.theguardian.com/environment/2017/apr/19/giraffes-endangered-species-conservation-hunting|work=The Guardian|access-date=April 29, 2018}}</ref>

The surge in the mass killings by [[poachers]] involved in the illegal ivory trade along with habitat loss is threatening [[African elephant]] populations.<ref>{{cite report |author1=UNEP |author2=CITES |author3=IUCN |author4=TRAFFIC |year=2013 |url=http://www.unep.org/pdf/RRAivory_draft7.pdf |title=Elephants in the Dust – The African Elephant Crisis |type=A Rapid Response Assessment |isbn=978-82-7701-111-0 |publisher=United Nations Environment Programme. Printed by Birkeland Trykkeri AS, Norway |archive-url=https://web.archive.org/web/20160810061656/http://www.unep.org/pdf/RRAivory_draft7.pdf |archive-date=2016-08-10|url-status=dead}}</ref><ref name="sevenyears">{{cite news|title=African Elephant Population Dropped 30 Percent in 7 Years|work=The New York Times |date=September 1, 2016 |url=https://www.nytimes.com/2016/09/02/world/africa/african-elephant-population-dropped-30-percent-in-7-years.html?_r=1 |url-access=subscription}}</ref> In 1979, their populations stood at 1.7 million; at present there are fewer than 400,000 remaining.<ref>{{cite web |last=Marche |first=Stephen |url=https://www.esquire.com/entertainment/movies/a50431/the-ivory-game-review-netflix/ |title=This Is the Most Important Issue That's Not Being Talked About in This Election |work=[[Esquire (magazine)|Esquire]] |date=November 7, 2016}}</ref> Prior to European colonization, scientists believe Africa was home to roughly 20 million elephants.<ref>{{cite web |last1=McKenzie |first1=David |last2=Formanek |first2=Ingrid |url=http://www.cnn.com/2016/08/31/africa/great-elephant-census/ |title=Our living dinosaurs |publisher=[[CNN]] |date=September 1, 2016|access-date=2022-11-10}}</ref> According to the [[Great Elephant Census]], 30% of African elephants (or 144,000 individuals) disappeared over a seven-year period, 2007 to 2014.<ref name="sevenyears"/><ref>{{cite news |last=McKenzie |first=David |date=December 31, 2016|title=We are failing the elephants |publisher=CNN |url=http://www.cnn.com/2016/12/11/world/vanishing-mckenzie-botswana-elephants/index.html|access-date=2022-11-10}}</ref> African elephants could become extinct by 2035 if poaching rates continue.<ref name="suttergiraffe"/>

[[File:Number of African elephants.svg|thumb|Decline in the number of African elephants since 1500 CE]]

Fishing has had a devastating effect on marine organism populations for several centuries even before the explosion of destructive and highly effective fishing practices like [[trawling]].<ref>{{Cite book|title=The Unnatural History of the Sea|last=Roberts|first=Callum|year=2007}}</ref> Humans are unique among predators in that they regularly prey on other adult [[apex predator]]s, particularly in marine environments;<ref name="Darimont-2015" /> [[bluefin tuna]], [[Blue whale|blue whales]], [[North Atlantic right whale]]s,<ref>{{cite news|author=Claudia Geib|date=July 16, 2020|title=North Atlantic right whales now officially 'one step from extinction' |url=https://www.theguardian.com/environment/2020/jul/16/north-atlantic-right-whales-critically-endangered-one-step-from-extinction|work=The Guardian|access-date=July 17, 2020}}</ref> and over fifty species of [[shark]]s and [[Batoidea|ray]]s are vulnerable to predation pressure from human fishing, in particular commercial fishing.<ref>{{cite news|last=Briggs|first=Helen |date=December 4, 2018|title=World's strangest sharks and rays 'on brink of extinction' |url=https://www.bbc.com/news/science-environment-46420736|work=BBC|access-date=December 10, 2018}}</ref> A 2016 study published in ''Science'' concludes that humans tend to hunt larger species, and this could disrupt ocean ecosystems for millions of years.<ref>{{cite journal|last1=Payne|first1=Jonathan L. |last2=Bush|first2=Andrew M.|last3= Heim|first3= Noel A.|last4=Knope| first4=Matthew L.|last5=McCauley |first5=Douglas J. |year=2016|title =Ecological selectivity of the emerging mass extinction in the oceans|journal=Science|volume=353|issue=6305|pages =1284–1286|doi =10.1126/science.aaf2416|pmid= 27629258|bibcode=2016Sci...353.1284P|doi-access=free}}</ref> A 2020 study published in ''[[Science Advances]]'' found that around 18% of marine megafauna, including iconic species such as the [[Great white shark]], are at risk of extinction from human pressures over the next century. In a worst-case scenario, 40% could go extinct over the same time period.<ref>{{cite news|last=Osborne|first=Hannah |date=April 17, 2020|title=Great White Sharks Among Marine Megafauna That Could Go Extinct in Next 100 Years, Study Warns|url=https://www.newsweek.com/great-white-shark-extinction-megafauna-1498592|work=[[Newsweek]]|access-date=April 28, 2020}}</ref> According to a 2021 study published in ''Nature'', 71% of oceanic shark and ray populations have been destroyed by [[overfishing]] (the primary driver of ocean [[defaunation]]) from 1970 to 2018, and are nearing the "point of no return" as 24 of the 31 species are now threatened with extinction, with several being classified as critically endangered.<ref>{{cite news|last=Yeung|first=Jessie |date=January 28, 2021|title=Shark and ray populations have dropped 70% and are nearing 'point of no return,' study warns|url=https://www.cnn.com/2021/01/28/world/sharks-rays-decline-study-intl-hnk-scli-scn/index.html|work=CNN|location=|access-date=January 28, 2021}}</ref><ref>{{cite journal|last1= Pacoureau|first1=Nathan|last2= Rigby |first2=Cassandra L.|display-authors=etal.|date=2021|title=Half a century of global decline in oceanic sharks and rays|url=|journal=[[Nature (journal)|Nature]]|volume=589|issue= 7843|pages=567–571|doi=10.1038/s41586-020-03173-9|pmid=33505035|bibcode=2021Natur.589..567P|hdl=10871/124531|s2cid=231723355|hdl-access=free}}</ref><ref>{{cite news|last=Einhorn|first=Catrin|date=January 27, 2021|title=Shark Populations Are Crashing, With a 'Very Small Window' to Avert Disaster|url=https://www.nytimes.com/2021/01/27/climate/sharks-population-study.html|work=[[The New York Times]]|location=|access-date=February 2, 2021}}</ref> Almost two thirds of sharks and rays around coral reefs are threatened with extinction from overfishing, with 14 of 134 species being critically endangered.<ref>{{cite journal |last1= Sherman|first1=C. Samantha|last2= Simpfendorfer|first2=Colin A.|display-authors=et al|date=2023 |title=Half a century of rising extinction risk of coral reef sharks and rays|url= |journal=[[Nature Communications]] |volume=14 |issue=15 |page=15 |doi=10.1038/s41467-022-35091-x|pmid=36650137 |pmc=9845228 |bibcode=2023NatCo..14...15S |access-date=}}</ref>

{{blockquote|text=If this pattern goes unchecked, the future oceans would lack many of the largest species in today's oceans. Many large species play critical roles in ecosystems and so their extinctions could lead to ecological cascades that would influence the structure and function of future ecosystems beyond the simple fact of losing those species.|source=Jonathan Payne, associate professor and chair of geological sciences at Stanford University<ref>{{cite news |last=Vaughan |first=Adam |date=September 14, 2016 |url=https://www.theguardian.com/environment/2016/sep/14/humanity-driving-unprecedented-marine-extinction |title=Humanity driving 'unprecedented' marine extinction |work=The Guardian}}</ref>}}
{{clear}}

===Disease===
{{See also|Decline in amphibian populations|White nose syndrome|Colony collapse disorder|Pesticide toxicity to bees}}
[[File:Bufo periglenes2.jpg|thumb|right|The [[golden toad]] of Costa Rica, extinct since around 1989. Its disappearance has been attributed to a confluence of several factors, including [[El Niño]] warming, fungus, habitat loss and the introduction of invasive species.<ref>{{cite journal|url=https://www.researchgate.net/publication/259639291|first1=L.|last1= Ochoa-Ochoa|first2=R. J.|last2=Whittaker|first3=R. J.|last3=Ladle|year=2013|title=The demise of the golden toad and the creation of a climate change icon species|journal=Conservation and Society|volume=11|issue=3|pages=291–319|doi=10.4103/0972-4923.121034|doi-access=free}}</ref>]]
[[File:Ecnomiohyla rabborum.jpg|thumb|left|[[Toughie (frog)|Toughie]], the last [[Ecnomiohyla rabborum|Rabbs' fringe-limbed treefrog]], died in September 2016.<ref>{{cite news |last=Hance |first=Jeremy |url=https://www.theguardian.com/environment/radical-conservation/2016/oct/27/rabbs-fringe-limbed-treefrog-frog-amphibians-extinct-extinction-media |title=Frog goes extinct, media yawns |work=The Guardian |date=27 October 2016}}</ref> The species was killed off by the [[Chytridiomycota|chytrid fungus]] ''[[Batrachochytrium dendrobatidis]]''<ref>{{Cite iucn|author=Mendelson, J.R.|author2=Angulo, A.|title=''Ecnomiohyla rabborum''|volume=2009 |page=e.T158613A5241303|date=2009|doi=10.2305/IUCN.UK.2009-2.RLTS.T158613A5241303.en|access-date=27 December 2017}}</ref>]]
The decline of amphibian populations has also been identified as an indicator of environmental degradation. As well as habitat loss, introduced predators and pollution, [[Chytridiomycosis]], a fungal infection accidentally spread by human travel,<ref name="Kolbert-2014" /> globalization, and the wildlife trade, has caused severe population drops of over 500 amphibian species, and perhaps 90 extinctions,<ref name="Scheele2019">{{cite journal|last1=Scheele |first1=Ben C.|display-authors=etal.|date=March 29, 2019 |title=Amphibian fungal panzootic causes catastrophic and ongoing loss of biodiversity|journal=[[Science (journal)|Science]]|volume=363|issue=6434|pages=1459–1463 |doi=10.1126/science.aav0379|pmid=30923224 |hdl=1885/160196|s2cid=85565860 |url=http://discovery.ucl.ac.uk/10069937/1/Garner_Scheele-et_al-Science_2019_Amphibian%20fungal%20panzootic%20causes%20catastrophic%20and%20ongoing%20loss%20of%20biodiversity.pdf |bibcode=2019Sci...363.1459S}}</ref> including (among many others) the extinction of the [[golden toad]] in Costa Rica, the [[Gastric-brooding frog]] in Australia, the [[Rabb's Fringe-limbed Treefrog|Rabb's fringe-limbed treefrog]] and the extinction of the [[Panamanian golden frog]] in the wild. Chytrid fungus has spread across Australia, New Zealand, Central America and Africa, including countries with high amphibian diversity such as [[cloud forest]]s in [[Honduras]] and [[Madagascar]]. ''[[Batrachochytrium salamandrivorans]]'' is a similar infection currently threatening [[salamander]]s. Amphibians are now the most endangered vertebrate group, having existed for more than 300 million years through three other [[mass extinction]]s.<ref name="Kolbert-2014"/>{{rp|17}}

Millions of bats in the US have been dying off since 2012 due to a fungal infection known as [[white-nose syndrome]] that spread from European bats, who appear to be immune. Population drops have been as great as 90% within five years, and extinction of at least one bat species is predicted. There is currently no form of treatment, and such declines have been described as "unprecedented" in bat evolutionary history by Alan Hicks of the [[New York State Department of Environmental Conservation]].<ref>{{cite journal|last1=Blehert |first1=D. S.|last2=Hicks |first2=A. C.|last3=Behr |first3=M. |last4=Meteyer |first4=C. U.|last5=Berlowski-Zier |first5=B. M. |last6=Buckles |first6=E. L. |last7=Coleman |first7=J. T. H. |last8=Darling |first8=S. R. |last9=Gargas |first9=A. |last10=Niver |first10=R.|last11=Okoniewski |first11=J. C.|last12=Rudd |first12=R. J. |last13=Stone |first13=W. B. |title=Bat White-Nose Syndrome: An Emerging Fungal Pathogen?|journal=Science|date=9 January 2009 |volume=323|issue=5911|pages=227|doi=10.1126/science.1163874|pmid=18974316|s2cid=23869393}}</ref>

Between 2007 and 2013, over ten million beehives were abandoned due to [[colony collapse disorder]], which causes [[worker bee]]s to abandon the [[queen bee|queen]].<ref>{{cite news|author1=Benjamin, A. |author2=Holpuch, A. |author3=Spencer, R.|newspaper=The Guardian|year=2013|access-date=21 August 2015 |title=Buzzfeeds: The effects of colony collapse disorder and other bee news |url=https://www.theguardian.com/environment/2013/jul/30/buzzfeeds-bees-colony-collapse-disorder}}</ref> Though no single cause has gained widespread acceptance by the scientific community, proposals include infections with ''[[Varroa]]'' and [[Acarapis woodi|''Acarapis'']] [[mite]]s; [[malnutrition]]; various [[pathogen]]s; [[genetics|genetic factors]]; [[immunodeficiency|immunodeficiencies]]; [[habitat destruction|loss of habitat]]; changing [[beekeeping]] practices; or a combination of factors.<ref>{{cite news|url= http://www.3news.co.nz/Multiple-causes-for-colony-collapse---report/tabid/1160/articleID/296401/Default.aspx|work= 3 News NZ|title= Multiple causes for colony collapse – report|date= 3 May 2013|access-date= 3 May 2013|archive-url= https://web.archive.org/web/20131029191137/http://www.3news.co.nz/Multiple-causes-for-colony-collapse---report/tabid/1160/articleID/296401/Default.aspx|archive-date= 29 October 2013|url-status= dead}}</ref><ref name=Cepero2014>{{cite journal|last1=Cepero|first1=Almudena|last2=Ravoet|first2=Jorgen|last3=Gómez-Moracho|first3=Tamara|last4=Bernal|first4=José Luis|last5=Del Nozal|first5=Maria J.|last6=Bartolomé |first6=Carolina|last7=Maside|first7=Xulio|last8=Meana|first8=Aránzazu|last9=González-Porto |first9=Amelia V.|last10=de Graaf|first10=Dirk C.|last11=Martín-Hernández|first11=Raquel|last12=Higes |first12=Mariano|title=Holistic screening of collapsing honey bee colonies in Spain: a case study |journal=BMC Research Notes|date=15 September 2014|volume=7|pages=649|doi=10.1186/1756-0500-7-649 |pmid=25223634|pmc=4180541|issn=1756-0500 |doi-access=free }}</ref>

== By region ==
[[Megafauna]] were once found on every continent of the world, but are now almost exclusively found on the continent of [[Africa]]. In some regions, megafauna experienced population crashes and [[trophic cascade]]s shortly after the earliest human settlers.<ref name="Perry-2014" /><ref name="Crowley-2010" /> Worldwide, 178 species of the world's largest mammals died out between 52,000 and 9,000 BC; it has been suggested that a higher proportion of African megafauna survived because they evolved alongside humans.<ref name="Ritchie-2021">{{Cite journal|last1=Ritchie|first1=Hannah|last2=Roser|first2=Max|date=2021-04-15|title=Habitat Loss|url=https://ourworldindata.org/habitat-loss|journal=[[Our World in Data]]}}</ref><ref name="Kolbert-2014" /> The timing of [[List of South American animals extinct in the Holocene|South American megafaunal extinction]] appears to precede human arrival, although the possibility that human activity at the time impacted the global climate enough to cause such an extinction has been suggested.<ref name="Kolbert-2014" />

=== Africa ===
{{See also|List of African animals extinct in the Holocene}}
[[Africa]] experienced the smallest decline in megafauna compared to the other continents. This is presumably due to the idea that Afroeurasian megafauna evolved alongside humans, and thus developed a healthy fear of them, unlike the comparatively tame animals of other continents.<ref name="Ritchie-2021" /><ref>{{cite book|last1=Elias|first1=S. A.|title=Vertebrate Records|last2=Schreve|first2=D. C.|publisher=Elsevier|year=2013|edition=2nd|series=Encyclopedia of Quaternary Science|location=Amsterdam|pages=700–711|chapter=Late Pleistocene Megafaunal Extinctions|chapter-url=https://pure.royalholloway.ac.uk/portal/files/17443890/late_pleistocene_megafaunal_extinctions.pdf}}{{dead link|date=July 2020|bot=medic}}{{cbignore|bot=medic}}</ref>

=== Eurasia ===
{{See also|List of Asian animals extinct in the Holocene|List of European animals extinct in the Holocene}}
[[File:Ice age fauna of northern Spain - Mauricio Antón.jpg|thumb|Many giant mammals such as [[woolly mammoth]]s, [[woolly rhinoceros]]es, and [[Panthera spelaea|cave lions]] inhabited the mammoth steppe during the Pleistocene.]]
Unlike other continents, the megafauna of Eurasia went extinct over a relatively long period of time, possibly due to climate fluctuations fragmenting and decreasing populations, leaving them vulnerable to over-exploitation, as with the [[steppe bison]] (''Bison priscus'').<ref>{{cite journal|last1=Pushkina|first1=D.|last2=Raia|first2=P.|year=2008|title=Human influence on distribution and extinctions of the late Pleistocene Eurasian megafauna|journal=[[Journal of Human Evolution]]|volume=54|issue=6|pages=769–782|doi=10.1016/j.jhevol.2007.09.024|pmid=18199470}}</ref> The warming of the arctic region caused the rapid decline of grasslands, which had a negative effect on the grazing megafauna of Eurasia. Most of what once was [[mammoth steppe]] was converted to [[mire]], rendering the environment incapable of supporting them, notably the [[woolly mammoth]].<ref>{{cite journal|last1=Mann|first1=Daniel H.|last2=Groves|first2=Pamela|last3=Reanier|first3=Richard E.|last4=Gaglioti|first4=Benjamin V.|last5=Kunz|first5=Michael L.|last6=Shapiro|first6=Beth|year=2015|title=Life and extinction of megafauna in the ice-age Arctic|journal=[[Proceedings of the National Academy of Sciences of the United States of America]]|volume=112|issue=46|pages=14301–14306|bibcode=2015PNAS..11214301M|doi=10.1073/pnas.1516573112|pmc=4655518|pmid=26578776|doi-access=free}}</ref>

In the western Mediterranean region, anthropogenic forest degradation began around 4,000 BP, during the Chalcolithic, and became especially pronounced during the [[Ancient Rome|Roman]] era. The reasons for the decline of forest ecosystems stem from agriculture, grazing, and mining.<ref>{{cite journal |last1=Gil-García |first1=María José |last2=Ruiz-Zapata |first2=Blanca |last3=Ortiz |first3=José E. |last4=Torres |first4=Trinidad |last5=Ros |first5=Milagros |last6=Ramallo |first6=Sebastián |last7=López-Cilla |first7=Ignacio |last8=Galán |first8=Luis A. |last9=Sánchez-Palencia |first9=Yolanda |last10=Manteca |first10=Ignacio |last11=Rodríguez-Estrella |first11=Tomás |last12=Blázquez |first12=Ana |last13=Gómez-Borrego |first13=Ángeles |date=1 March 2022 |title=Paleoenvironmental variability and anthropic influence during the last 7300 years in the western Mediterranean based on the pollen record of Cartagena Bay, SE Spain |url=https://www.sciencedirect.com/science/article/abs/pii/S0031018222000098 |journal=[[Palaeogeography, Palaeoclimatology, Palaeoecology]] |volume=589 |page=110839 |doi=10.1016/j.palaeo.2022.110839 |bibcode=2022PPP...58910839G |access-date=15 January 2023}}</ref> During the twilight years of the [[Western Roman Empire]], forests in northwestern Europe rebounded from losses incurred throughout the Roman period, though deforestation on a large scale resumed once again around 800 BP, during the [[High Middle Ages]].<ref>{{cite journal |last1=Lambert |first1=C. |last2=Penaud |first2=A. |last3=Vidal |first3=M. |last4=Gandini |first4=C. |last5=Labeyrie |first5=L. |last6=Chavaud |first6=L. |last7=Ehrhold |first7=A. |date=15 December 2020 |title=Striking forest revival at the end of the Roman Period in north-western Europe |journal=[[Scientific Reports]] |volume=10 |issue=1 |page=21984 |doi=10.1038/s41598-020-77253-1 |pmid=33319781 |pmc=7738505 |bibcode=2020NatSR..1021984L }}</ref>

In southern China, human land use is believed to have permanently altered the trend of vegetation dynamics in the region, which was previously governed by temperature. This is evidenced by high fluxes of charcoal from that time interval.<ref>{{cite journal |last1=Cheng |first1=Zhongjing |last2=Weng |first2=Chengyu |last3=Steinke |first3=Stephan |last4=Mohtadi |first4=Mahyar |date=29 October 2018 |title=Anthropogenic modification of vegetated landscapes in southern China from 6,000 years ago |url=https://www.nature.com/articles/s41561-018-0250-1?error=cookies_not_supported&code=091f40e9-e7f1-452d-b2e7-b9df48a7062a |journal=[[Nature Geoscience]] |volume=11 |issue=12 |pages=939–943 |doi=10.1038/s41561-018-0250-1 |bibcode=2018NatGe..11..939C |s2cid=133729236 |access-date=11 April 2023}}</ref>

=== Americas ===
{{Main|List of North American animals extinct in the Holocene|List of South American animals extinct in the Holocene}}
[[File:Mammoth House (Replica).JPG|thumb|left|Reconstructed [[woolly mammoth]] bone hut, based on finds in [[Mezhyrich, Cherkasy Oblast|Mezhyrich]].]]
[[File:Ectopistes migratorius (passenger pigeon).jpg|thumb|upright|The [[passenger pigeon]] was a species of [[pigeon]] endemic to [[North America]]. It experienced a rapid decline in the late 1800s due to habitat destruction and intense hunting after the arrival of Europeans. The last wild bird is thought to have been shot in 1901.]]
There has been a debate as to the extent to which the disappearance of [[megafauna]] at the end of the last [[glacial period]] can be attributed to human activities by hunting, or even by slaughter{{efn|This may refer to groups of animals endangered by climate change. For example, during a catastrophic drought, remaining animals would be gathered around the few remaining watering holes, and thus become extremely vulnerable.}} of prey populations. Discoveries at Monte Verde in South America and at [[Meadowcroft Rock Shelter]] in Pennsylvania have caused a controversy<ref name="ReferenceA">{{Cite book |last=Haynes |first=Gary |url=https://www.worldcat.org/oclc/49327000 |title=The early settlement of North America : the Clovis era |date=2002 |isbn=0-521-81900-8 |location=Cambridge |oclc=49327000 |pages=18–19}}</ref> regarding the [[Clovis culture]]. There likely would have been human settlements prior to the Clovis culture, and the history of [[Prehistoric migration and settlement of the Americas from Asia|humans in the Americas]] may extend back many thousands of years before the Clovis culture.<ref name="ReferenceA" /> The amount of correlation between human arrival and megafauna extinction is still being debated: for example, in [[Wrangel Island]] in Siberia the extinction of dwarf [[woolly mammoth]]s (approximately 2000 BCE)<ref>{{cite journal|last1=Martin|first1=P.S.|year=1995|title=Mammoth Extinction: Two Continents and Wrangel Island|journal=Radiocarbon|volume=37|issue=1|pages=7–10|doi=10.1017/s0033822200014739|bibcode=1995Radcb..37....7M |doi-access=free}}</ref> did not coincide with the arrival of humans, nor did megafaunal mass extinction on the South American continent, although it has been suggested climate changes induced by anthropogenic effects elsewhere in the world may have contributed.<ref name="Kolbert-2014" />

[[File:Glyptodon old drawing.jpg|thumb|right|Illustration of [[Paleo-Indians]] hunting a [[glyptodon]]]]

Comparisons are sometimes made between recent extinctions (approximately since the [[industrial revolution]]) and the Pleistocene extinction near the end of the last [[glacial period]]. The latter is exemplified by the extinction of large herbivores such as the [[woolly mammoth]] and the carnivores that preyed on them. Humans of this era actively hunted the [[mammoth]] and the [[mastodon]],<ref>{{cite journal |last1=Pitulko |first1=V. V. |last2=Nikolsky |first2=P. A. |last3=Girya |first3=E. Y. |last4=Basilyan |first4=A. E.|last5=Tumskoy |first5=V. E. |last6=Koulakov |first6=S. A. |last7=Astakhov |first7=S. N. |last8=Pavlova |first8=E. Y.|last9=Anisimov |first9=M. A. |year=2004 |title=The Yana RHS site: Humans in the Arctic before the Last Glacial Maximum |url=https://www.science.org/doi/10.1126/science.1085219 |journal=[[Science (journal)|Science]] |volume=303 |issue=5654 |pages=52–56 |bibcode=2004Sci...303...52P |doi=10.1126/science.1085219 |pmid=14704419 |s2cid=206507352 |access-date=21 March 2023}}</ref> but it is not known if this hunting was the cause of the subsequent massive ecological changes, widespread extinctions and climate changes.<ref name="Doughty, C. E. 2010" /><ref name="link.springer.com" />

The ecosystems encountered by the first Americans had not been exposed to human interaction, and may have been far less resilient to human made changes than the ecosystems encountered by industrial era humans. Therefore, the actions of the Clovis people, despite seeming insignificant by today's standards could indeed have had a profound effect on the ecosystems and wild life which was entirely unused to human influence.<ref name="Kolbert-2014" />

In the Yukon, the mammoth steppe ecosystem collapsed between 13,500 and 10,000 BP, though wild horses and woolly mammoths somehow persisted in the region for millennia after this collapse.<ref>{{cite journal |last1=Murchie |first1=Tyler J. |last2=Monteath |first2=Alistair J. |last3=Mahony |first3=Matthew E. |last4=Long |first4=George S. |last5=Cocker |first5=Scott |last6=Sadoway |first6=Tara |last7=Karpinski |first7=Emil |last8=Zazula |first8=Grant |last9=MacPhee |first9=Ross D. E. |last10=Froese |first10=Duane |last11=Poinar |first11=Hendrik N. |date=8 December 2021 |title=Collapse of the mammoth-steppe in central Yukon as revealed by ancient environmental DNA |journal=[[Nature Communications]] |volume=12 |issue=1 |page=7120 |doi=10.1038/s41467-021-27439-6 |pmid=34880234 |pmc=8654998 |bibcode=2021NatCo..12.7120M }}</ref> In what is now Texas, a drop in local plant and animal biodiversity occurred during the Younger Dryas cooling, though while plant diversity recovered after the Younger Dryas, animal diversity did not.<ref>{{cite journal |last1=Seersholm |first1=Frederik V. |last2=Werndly |first2=Daniel J. |last3=Grealy |first3=Alicia |last4=Johnson |first4=Taryn |last5=Keenan Early |first5=Erin M. |last6=Lundelius Jr. |first6=Ernest L. |last7=Winsborough |first7=Barbara |last8=Farr |first8=Grayal Earle |last9=Toomey |first9=Rickard |last10=Hansen |first10=Anders J. |last11=Shapiro |first11=Beth |last12=Waters |first12=Michael R. |last13=McDonald |first13=Gregory |last14=Linderholm |first14=Anna |last15=Stafford Jr. |first15=Thomas W. |last16=Bunce |first16=Michael |date=2 June 2020 |title=Rapid range shifts and megafaunal extinctions associated with late Pleistocene climate change |journal=[[Nature Communications]] |volume=11 |issue=1 |page=2770 |doi=10.1038/s41467-020-16502-3 |pmid=32488006 |pmc=7265304 |bibcode=2020NatCo..11.2770S }}</ref> In the [[Channel Islands (California)|Channel Islands]], multiple terrestrial species went extinct around the same time as human arrival, but direct evidence for an anthropogenic cause of their extinction remains lacking.<ref>{{cite journal |last1=Louys |first1=Julien |last2=Braje |first2=Todd J. |last3=Chang |first3=Chun-Hsiang |last4=Cosgrove |first4=Richard |last5=Fitzpatrick |first5=Scott M. |last6=Fujita |first6=Masaki |last7=Hawkins |first7=Stuart |last8=Ingicco |first8=Stuart |last9=Kawamura |first9=Ai |last10=MacPhee |first10=Ross D. E. |last11=McDowell |first11=Matthew C. |last12=Meijer |first12=Hanneke J. M. |last13=Piper |first13=Philip J. |last14=Roberts |first14=Patrick |last15=Simmons |first15=Alan H. |last16=Van den Bergh |first16=Gerrit |last17=Van der Geer |first17=Alexandra |last18=Kealy |first18=Shimona |last19=O'Connor |first19=Sue |date=3 May 2021 |title=No evidence for widespread island extinctions after Pleistocene hominin arrival |journal=[[Proceedings of the National Academy of Sciences of the United States of America]] |volume=118 |issue=20 |pages=1–8 |doi=10.1073/pnas.2023005118 |pmid=33941645 |pmc=8157961 |bibcode=2021PNAS..11823005L |doi-access=free }}</ref> In the montane forests of the Colombian Andes, spores of coprophilous fungi indicate megafaunal extinction occurred in two waves, the first occurring around 22,900 BP and the second around 10,990 BP.<ref>{{cite journal |last1=Pym |first1=Felix C. |last2=Franco-Gaviria |first2=Felipe |last3=Espinoza |first3=Ismael G. |last4=Urrego |first4=Dunia H. |date=26 April 2023 |title=The timing and ecological consequences of Pleistocene megafaunal decline in the eastern Andes of Colombia |url=https://www.cambridge.org/core/journals/quaternary-research/article/abs/timing-and-ecological-consequences-of-pleistocene-megafaunal-decline-in-the-eastern-andes-of-colombia/93E12371830647431A5BB3CA25CA6DFB |journal=[[Quaternary Research]] |volume=114 |pages=1–17 |doi=10.1017/qua.2022.66 |bibcode=2023QuRes.114....1P |s2cid=258362772 |access-date=29 April 2023|hdl=10871/133219 |hdl-access=free }}</ref> A 2023 study of megafaunal extinctions in the Junín Plateau of [[Peru]] found that the timing of the disappearance of megafauna was concurrent with a large uptick in fire activity attributed to human actions, implicating humans as the cause of their local extinction on the plateau.<ref>{{cite journal |last1=Rozas-Davila |first1=Angela |last2=Rodbell |first2=Donald T. |last3=Bush |first3=Mark B. |date=24 January 2023 |title=Pleistocene megafaunal extinction in the grasslands of Junín-Peru |url=https://onlinelibrary.wiley.com/doi/10.1111/jbi.14566 |journal=[[Journal of Biogeography]] |volume=50 |issue=4 |pages=755–766 |doi=10.1111/jbi.14566 |bibcode=2023JBiog..50..755R |s2cid=256255790 |access-date=21 March 2023}}</ref>

=== Australia ===
{{Main|Australian megafauna|List of extinct animals of Australia|List of extinct flora of Australia}}
{{See also|Invasive species in Australia|Land clearing in Australia|Fire-stick farming}}
[[File:Diprotodon sculpture.jpg|thumb|Reconstruction of a hippopotamus-sized ''[[Diprotodon]]'']]
[[Australia]] was once home to a [[Australian megafauna|large assemblage of megafauna]], with many parallels to those found on the African continent today. Australia's fauna is characterized by primarily [[marsupial]] mammals, and many reptiles and birds, all existing as giant forms until recently. [[Indigenous Australians|Humans]] arrived on the continent very early, about 50,000 years ago.<ref name="Kolbert-2014" /> The extent human arrival contributed is controversial; climatic drying of Australia 40,000–60,000 years ago was an unlikely cause, as it was less severe in speed or magnitude than previous regional climate change which failed to kill off megafauna. Extinctions in Australia continued from original settlement until today in both [[List of extinct flora of Australia|plants]] and [[List of extinct animals of Australia|animals]], whilst [[Threatened fauna of Australia|many more animals]] and [[List of threatened flora of Australia|plants]] have declined or are endangered.<ref>{{Cite news|title=Australian endangered species list|work=Australian Geographic |url=http://www.australiangeographic.com.au/topics/science-environment/2014/06/australian-endangered-species-list|access-date=2017-04-04}}</ref>

Due to the older timeframe and the soil chemistry on the continent, very little [[subfossil]] preservation evidence exists relative to elsewhere.<ref name="UniColoradoBoulder-2016">{{Cite web|title=Ancient extinction of giant Australian bird points to humans|author=University of Colorado at Boulder|date=January 29, 2016 |website=ScienceDaily|url=https://www.sciencedaily.com/releases/2016/01/160129090057.htm|access-date=2016-02-01}}</ref> However, continent-wide extinction of all genera weighing over 100 kilograms, and six of seven genera weighing between 45 and 100 kilograms occurred around 46,400 years ago (4,000 years after human arrival)<ref>{{Cite web|author1=Richard G. Roberts |author4=Timothy F. Flannery |author5=Linda K. Ayliffe |author6=Hiroyuki Yoshida |author7=Jon M. Olley |author8=Gavin J. Prideaux |author9=Geoff M. Laslett |author10=Alexander Baynes |author11=M. A. Smith |author12=Rhys Jones |author13=Barton L. Smith |title=New Ages for the Last Australian Megafauna: Continent-Wide Extinction About 46,000 Years Ago |date=8 June 2001 |volume=292 |magazine=Science |url=http://www.uow.edu.au/content/groups/public/@web/@sci/@eesc/documents/doc/uow014698.pdf}}</ref> and the fact that megafauna survived until a later date on the island of [[Tasmania]] following the establishment of a land bridge<ref>{{Cite journal|last1=Turney|first1=Chris S. M.|last2=Flannery |first2=Timothy F.|last3=Roberts|first3=Richard G.|last4=Reid|first4=Craig|last5=Fifield|first5=L. Keith |last6=Higham|first6=Tom F. G.|last7=Jacobs |first7=Zenobia|last8=Kemp|first8=Noel|last9=Colhoun |first9=Eric A.|date=2008-08-21|title=Late-surviving megafauna in Tasmania, Australia, implicate human involvement in their extinction|journal=Proceedings of the National Academy of Sciences|volume=105 |issue=34|pages=12150–12153|bibcode=2008PNAS..10512150T|doi=10.1073/pnas.0801360105|issn=0027-8424 |pmc=2527880|pmid=18719103|doi-access=free}}</ref> suggest direct hunting or anthropogenic ecosystem disruption such as [[fire-stick farming]] as likely causes. The first evidence of direct human predation leading to extinction in Australia was published in 2016.<ref name="Miller-2016">{{Cite journal |last1=Miller |first1=Gifford |last2=Magee |first2=John |last3=Smith |first3=Mike |last4=Spooner |first4=Nigel |last5=Baynes |first5=Alexander |last6=Lehman |first6=Scott |last7=Fogel |first7=Marilyn |last8=Johnston |first8=Harvey |last9=Williams |first9=Doug |date=2016-01-29 |title=Human predation contributed to the extinction of the Australian megafaunal bird Genyornis newtoni [sim]47 ka |journal=Nature Communications |volume=7 |pages=10496 |bibcode=2016NatCo...710496M |doi=10.1038/ncomms10496 |pmc=4740177 |pmid=26823193}}</ref>

A 2021 study found that the rate of extinction of Australia's megafauna is rather unusual, with some generalistic species having gone extinct earlier while highly specialized ones having become extinct later or even still surviving today. A mosaic cause of extinction with different anthropogenic and environmental pressures has been proposed.<ref>{{cite journal|last1=Bradshaw|first1=Corey J. A. |last2=Johnson|first2=Christopher N. |last3=Llewelyn|first3=John|last4=Weisbecker|first4=Vera |last5=Strona|first5=Giovanni|last6=Saltré|first6=Frédérik|date=30 March 2021|title=Relative demographic susceptibility does not explain the extinction chronology of Sahul's megafauna |journal=eLife|location=Cambridge, UK|publisher=eLife Sciences Publications|volume=10 |doi=10.7554/eLife.63870|pmc=8043753|pmid=33783356|doi-access=free}}</ref>

=== Caribbean ===
[[File:Vogeleiland.jpg|thumb|Recently extinct flightless birds include Madagascar's [[elephant bird]] (left), Mauritius's [[dodo]] and the [[great auk]] of the Atlantic (bottom right).]]
[[History of the Caribbean|Human arrival]] in the [[Caribbean]] around 6,000 years ago is correlated with the extinction of many species.<ref>{{Cite web|title=North American Extinctions v. World |url=http://www.thegreatstory.org/charts/NA-extinctions.html|access-date=2016-01-31|website=www.thegreatstory.org}}</ref> These include many different genera of [[Pilosans of the Caribbean|ground and arboreal sloths]] across all islands. These sloths were generally smaller than those found on the South American continent. ''[[Megalocnus]]'' were the largest genus at up to {{convert|90|kg|lbs}}, ''[[Acratocnus]]'' were medium-sized relatives of modern [[two-toed sloth]]s endemic to [[Cuba]], ''[[Imagocnus]]'' also of Cuba, ''[[Neocnus]]'' and many others.<ref>{{cite journal|last1=Steadman|first1=D.W.|author1-link=David Steadman|last2=Martin|first2=P.S.|author2-link=Paul Schultz Martin|author3=MacPhee, R.D.E.|author4=Jull, A.J.T.|author5=McDonald, H.G.|author6=Woods, C.A.|author7=Iturralde-Vinent, M.|author8=Hodgins, G.W.L.|date=2005|title=Asynchronous extinction of late Quaternary sloths on continents and islands|journal=Proceedings of the National Academy of Sciences|volume=102|issue=33|pages=11763–11768|bibcode=2005PNAS..10211763S|doi=10.1073/pnas.0502777102|pmc=1187974|pmid=16085711|doi-access=free}}</ref>

=== Macaronesia ===
The arrival of the first human settlers in the [[Azores]] saw the introduction of invasive plants and livestock to the archipelago, resulting in the extinction of at least two plant species on [[Pico Island]].<ref>{{cite journal |last1=Connor |first1=Simon E. |last2=Van Leeuwen |first2=Jacqueline F. N. |last3=Rittenour |first3=Tammy M. |last4=Van der Knaap |first4=Willem O. |last5=Ammann |first5=Brigitta |last6=Björck |first6=Svante |date=23 January 2012 |title=The ecological impact of oceanic island colonization – a palaeoecological perspective from the Azores |url=https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-2699.2011.02671.x |journal=[[Journal of Biogeography]] |volume=39 |issue=6 |pages=1007–1023 |doi=10.1111/j.1365-2699.2011.02671.x |bibcode=2012JBiog..39.1007C |hdl=11343/55221 |s2cid=86191735 |access-date=3 December 2022|hdl-access=free }}</ref> On [[Faial Island]], the decline of ''[[Prunus lusitanica]]'' has been hypothesized by some scholars to have been related to the tree species being endozoochoric, with the extirpation or extinction of various bird species drastically limiting its seed dispersal.<ref>{{cite journal |last1=Góis-Marques |first1=C. A. |last2=Rubiales |first2=J. M. |last3=De Nascimento |first3=L. |last4=Menezes de Sequeira |first4=M. |last5=Fernández-Palacios |first5=J. M. |last6=Madeira |first6=J. |date=February 2020 |title=Oceanic Island forests buried by Holocene (Meghalayan) explosive eruptions: palaeobiodiversity in pre-anthropic volcanic charcoal from Faial Island (Azores, Portugal) and its palaeoecological implications |url=https://www.sciencedirect.com/science/article/abs/pii/S0034666719302386 |journal=[[Review of Palaeobotany and Palynology]] |volume=273 |page=104116 |doi=10.1016/j.revpalbo.2019.104116 |bibcode=2020RPaPa.27304116G |hdl=10400.13/4177 |s2cid=210280909 |access-date=31 December 2022|hdl-access=free }}</ref> Lacustrine ecosystems were ravaged by human colonization, as evidenced by hydrogen isotopes from C<sub>30</sub> fatty acids recording hypoxic bottom waters caused by eutrophication in Lake Funda on [[Flores Island (Azores)|Flores Island]] beginning between 1500 and 1600 AD.<ref>{{cite journal |last1=Richter |first1=Nora |last2=Russell |first2=James M. |last3=Amaral-Zettler |first3=Linda |last4=DeGroff |first4=Wylie |last5=Raposeiro |first5=Pedro M. |last6=Gonçalves |first6=Vítor |last7=De Boer |first7=Erik J. |last8=Pla-Rabes |first8=Sergi |last9=Hernández |first9=Armand |last10=Benavente |first10=Mario |last11=Ritter |first11=Catarina |last12=Sáez |first12=Alberto |last13=Bao |first13=Roberto |last14=Trigo |first14=Ricardo M. |last15=Prego |first15=Ricardo |last16=Giralt |first16=Santiago |date=1 June 2022 |title=Long-term hydroclimate variability in the sub-tropical North Atlantic and anthropogenic impacts on lake ecosystems: A case study from Flores Island, the Azores |url=https://www.sciencedirect.com/science/article/abs/pii/S0277379122001561 |journal=[[Quaternary Science Reviews]] |volume=285 |page=107525 |doi=10.1016/j.quascirev.2022.107525 |bibcode=2022QSRv..28507525R |hdl=10261/269568 |access-date=30 November 2022|hdl-access=free }}</ref>

The arrival of humans on the archipelago of [[Madeira]] caused the extinction of approximately two-thirds of its endemic bird species, with two non-endemic birds also being locally extirpated from the archipelago.<ref name="MadeiranMice">{{cite journal |last1=Rando |first1=Juan Carlos |last2=Pieper |first2=Harald |last3=Alcover |first3=Josep Antoni |date=7 April 2014 |title=Radiocarbon evidence for the presence of mice on Madeira Island (North Atlantic) one millennium ago |journal=Proceedings of the Royal Society B |volume=281 |issue=1780 |pages=1–5 |doi=10.1098/rspb.2013.3126 |pmid=24523273 |pmc=4027395 }}</ref> Of thirty-four land snail species collected in a subfossil sample from eastern [[Madeira Island]], nine became extinct following the arrival of humans.<ref>{{cite journal |last1=Goodfriend |first1=Glenn A. |last2=Cameron |first2=Robert A. D. |last3=Cook |first3=L. M. |date=May 1994 |title=Fossil Evidence of Recent Human Impact on the Land Snail Fauna of Madeira |url=https://www.jstor.org/stable/2845532 |journal=[[Journal of Biogeography]] |volume=21 |issue=3 |pages=309–320 |doi=10.2307/2845532 |jstor=2845532 |bibcode=1994JBiog..21..309G |access-date=30 December 2022}}</ref> On the [[Desertas Islands]], of forty-five land snail species known to exist before human colonization, eighteen are extinct and five are no longer present on the islands.<ref>{{cite journal |last1=Teixeira |first1=Dinarte |last2=Groh |first2=Klaus |last3=Yanes |first3=Yurena |last4=Pokryszko |first4=Beata M. |last5=Silva |first5=Isamberto |last6=Cameron |first6=Robert A. D. |date=7 May 2022 |title=Late Quaternary land snail faunas of the Desertas Islands (Madeira): high diversity and endemism followed by recent impoverishment and extinction |url=https://academic.oup.com/mollus/article-abstract/88/2/eyac010/6581786?redirectedFrom=fulltext&login=false |journal=[[Journal of Molluscan Studies]] |volume=88 |issue=2 |pages= |doi=10.1093/mollus/eyac010 |access-date=30 December 2022}}</ref> ''[[Eurya|Eurya stigmosa]]'', whose extinction is typically attributed to climate change following the end of the Pleistocene rather than humans, may have survived until the colonization of the archipelago by the Portuguese and gone extinct as a result of human activity.<ref>{{cite journal |last1=Góis-Marques |first1=Carlos A. |last2=Mitchell |first2=Ria L. |last3=de Nascimento |first3=Lea |last4=Fernández-Palacios |first4=José María |last5=Madeira |first5=José |last6=Menezes de Sequeira |first6=Miguel |title=Eurya stigmosa (Theaceae), a new and extinct record for the Calabrian stage of Madeira Island (Portugal): 40Ar/39Ar dating, palaeoecological and oceanic island palaeobiogeographical implications |url=https://www.sciencedirect.com/science/article/abs/pii/S0277379118309284 |journal=Quaternary Science Reviews |date=February 2019 |volume=206 |pages=129–140 |doi=10.1016/j.quascirev.2019.01.008 |bibcode=2019QSRv..206..129G |hdl=10400.13/4182 |s2cid=134725615 |access-date=30 December 2022|hdl-access=free }}</ref> Introduced mice have been implicated as a leading driver of extinction on Madeira following its discovery by humans.<ref name="MadeiranMice" />

In the [[Canary Islands]], native thermophilous woodlands were decimated and two tree taxa were driven extinct following the arrival of its first humans, primarily as a result of increased fire clearance and soil erosion and the introduction of invasive pigs, goats, and rats. Invasive species introductions accelerated during the [[Age of Discovery]] when Europeans first settled the [[Macaronesia]]n archipelago. The archipelago's laurel forests, though still negatively impacted, fared better due to being less suitable for human economic use.<ref name="Castilla-Beltrán2021PNAS">{{cite journal |last1=Castilla-Beltrán |first1=Alvaro |last2=De Nascimento |first2=Lea |last3=Fernández-Palacios |first3=José-María |last4=Whittaker |first4=Robert J. |last5=Willis |first5=Kathy J. |last6=Edwards |first6=Mary |last7=Nogué |first7=Sandra |date=27 September 2021 |title=Anthropogenic transitions from forested to human-dominated landscapes in southern Macaronesia |journal=[[Proceedings of the National Academy of Sciences of the United States of America]] |volume=118 |issue=40 |doi=10.1073/pnas.2022215118 |pmid=34580208 |pmc=8501805 |bibcode=2021PNAS..11822215C |doi-access=free }}</ref>

[[Cabo Verde]], like the Canary Islands, witnessed precipitous deforestation upon the arrival of European settlers and various invasive species brought by them in the archipelago,<ref name="Castilla-Beltrán2021Biogeography">{{cite journal |last1=Castilla-Beltrán |first1=Alvaro |last2=De Nascimento |first2=Lea |last3=Fernández-Palacios |first3=José-María |last4=Whittaker |first4=Robert J. |last5=Romeiras |first5=Maria M. |last6=Cundy |first6=Andrew B. |last7=Edwards |first7=Mary |last8=Nogué |first8=Sandra |date=22 March 2021 |title=Effects of Holocene climate change, volcanism and mass migration on the ecosystem of a small, dry island (Brava, Cabo Verde) |url=https://onlinelibrary.wiley.com/doi/10.1111/jbi.14084 |journal=[[Journal of Biogeography]] |volume=48 |issue=6 |pages=1392–1405 |doi=10.1111/jbi.14084 |bibcode=2021JBiog..48.1392C |hdl=10400.5/21368 |s2cid=233708086 |access-date=30 November 2022|hdl-access=free }}</ref> with the archipelago's thermophilous woodlands suffering the greatest destruction.<ref name="Castilla-Beltrán2021PNAS" /> Introduced species, overgrazing, increased fire incidence, and soil degradation have been attributed as the chief causes of Cabo Verde's ecological devastation.<ref name="Castilla-Beltrán2021Biogeography" /><ref name="Castilla-Beltrán2019PPP">{{cite journal |last1=Castilla-Beltrán |first1=Alvaro |last2=De Nascimento |first2=Lea |last3=Fernández-Palacios |first3=José-María |last4=Fonville |first4=Thierry |last5=Whittaker |first5=Robert J. |last6=Edwards |first6=Mary |last7=Nogué |first7=Sandra |date=15 June 2019 |title=Late Holocene environmental change and the anthropization of the highlands of Santo Antão Island, Cabo Verde |url=https://www.sciencedirect.com/science/article/abs/pii/S0031018218310605 |journal=[[Palaeogeography, Palaeoclimatology, Palaeoecology]] |volume=524 |pages=101–117 |doi=10.1016/j.palaeo.2019.03.033 |bibcode=2019PPP...524..101C |s2cid=120143295 |access-date=30 November 2022}}</ref>

=== Pacific ===
Archaeological and paleontological digs on 70 different [[Pacific islands]] suggested that numerous species became extinct as people moved across the Pacific, starting 30,000 years ago in the [[Bismarck Archipelago]] and [[Solomon Islands]].<ref>{{cite journal|last1=Steadman|first1=D. W.|last2=Martin |first2=P. S.|year=2003|title=The late Quaternary extinction and future resurrection of birds on Pacific islands|journal=[[Earth-Science Reviews]]|volume=61|issue=1–2|pages=133–147|doi=10.1016/S0012-8252(02)00116-2|bibcode=2003ESRv...61..133S}}</ref> It is currently estimated that among the bird species of the Pacific, some 2000 species have gone extinct since the arrival of humans, representing a 20% drop in the biodiversity of birds worldwide.<ref>{{cite journal|last=Steadman|first=D. W.|author-link=David Steadman|year=1995|title=Prehistoric extinctions of Pacific island birds: biodiversity meets zooarchaeology|journal=[[Science (journal)|Science]]|volume=267|issue=5201|pages=1123–1131 |doi=10.1126/science.267.5201.1123|bibcode=1995Sci...267.1123S|pmid=17789194|s2cid=9137843 }}</ref> In Polynesia, the Late Holocene declines in avifaunas only abated after they were heavily depleted and there were increasingly fewer bird species able to be driven to extinction.<ref>{{Cite journal |last=Steadman |first=David W. |date=1 March 1989 |title=Extinction of birds in Eastern polynesia: A review of the record, and comparisons with other Pacific Island groups |url=https://dx.doi.org/10.1016/0305-4403%2889%2990065-4 |journal=[[Journal of Archaeological Science]] |volume=16 |issue=2 |pages=177–205 |doi=10.1016/0305-4403(89)90065-4 |bibcode=1989JArSc..16..177S |issn=0305-4403 |access-date=20 January 2024 |via=Elsevier Science Direct}}</ref> Additionally, the endemic faunas of Pacific archipelagos are exceptionally at risk in the coming decades due to rising sea levels caused by global warming.<ref>{{Cite journal |last1=Kumar |first1=Lalit |last2=Tehrany |first2=Mahyat Shafapour |date=13 July 2017 |title=Climate change impacts on the threatened terrestrial vertebrates of the Pacific Islands |journal=[[Scientific Reports]] |language=en |volume=7 |issue=1 |pages=5030 |doi=10.1038/s41598-017-05034-4 |pmid=28706225 |issn=2045-2322 |pmc=5509733 |bibcode=2017NatSR...7.5030K }}</ref>

The endemic megafaunal meiolaniid turtles of Vanuatu became extinct immediately following the first human arrivals and remains of them containing evidence of butchery by humans have been found.<ref>{{Cite journal |last1=White |first1=Arthur W. |last2=Worthy |first2=Trevor H. |last3=Hawkins |first3=Stuart |last4=Bedford |first4=Stuart |last5=Spriggs |first5=Matthew |date=16 August 2010 |title=Megafaunal meiolaniid horned turtles survived until early human settlement in Vanuatu, Southwest Pacific |journal=[[Proceedings of the National Academy of Sciences of the United States of America]] |language=en |volume=107 |issue=35 |pages=15512–15516 |doi=10.1073/pnas.1005780107 |doi-access=free |issn=0027-8424 |pmc=2932593 |pmid=20713711 |bibcode=2010PNAS..10715512W }}</ref>

The arrival of humans in [[New Caledonia]] marked the commencement of coastal forest and mangrove decline on the island.<ref>{{Cite journal |last=Stevenson |first=Janelle |date=September 2004 |title=A late-Holocene record of human impact from the southwest coast of New Caledonia |url=https://journals.sagepub.com/doi/abs/10.1191/0959-683604hl755rp |journal=[[The Holocene]] |volume=14 |issue=6 |pages=888–898 |doi=10.1191/0959-683604hl755rp |bibcode=2004Holoc..14..888S |s2cid=44797352 |access-date=20 January 2024 |via=Sage Journals}}</ref> The archipelago's megafauna was still extant when humans arrived, but indisputable evidence for the anthropogenicity of their extinction remains elusive.<ref>{{Cite journal |last1=Anderson |first1=Atholl |last2=Sand |first2=Christophe |last3=Petchey |first3=Fiona |last4=Worthy |first4=Trevor H. |title=Faunal extinction and human habitation in New Caledonia: Initial results and implications of new research at the Pindai Caves |url=https://researchcommons.waikato.ac.nz/handle/10289/5404 |journal=Journal of Pacific Archaeology |volume=1 |issue=1 |pages=89–109 |access-date=20 January 2024}}</ref>

In Fiji, the giant iguanas ''[[Brachylophus gibbonsi]]'' and ''[[Lapitiguana|Lapitiguana impensa]]'' both succumbed to human-induced extinction shortly after encountering the first humans on the island.<ref>{{Cite journal |last1=Pregill |first1=Gregory K. |last2=Steadman |first2=David W. |date=1 March 2004 |title=South Pacific Iguanas: Human Impacts and a New Species |url=http://www.bioone.org/doi/abs/10.1670/73-03A |journal=[[Journal of Herpetology]] |language=en |volume=38 |issue=1 |pages=15–21 |doi=10.1670/73-03A |s2cid=85627049 |issn=0022-1511 |access-date=20 January 2024}}</ref>

In [[American Samoa]], deposits dating back to the period of initial human colonisation contain elevated quantities of bird, turtle, and fish remains caused by increased predation pressure.<ref>{{Cite journal |last1=Weisler |first1=Marshall I. |last2=Lambrides |first2=Ariana B. J. |last3=Quintus |first3=Seth |last4=Clark |first4=Jeffrey |last5=Worthy |first5=Trevor H. |date=2016 |title=Colonisation and late period faunal assemblages from Ofu Island, American Samoa |url=https://researchonline.jcu.edu.au/59061/ |journal=Journal of Pacific Archeology |volume=7 |issue=2 |pages=1–19 |access-date=20 January 2024}}</ref>

The [[Ancient Hawaii|first human settlers]] of the [[Hawaiian Islands|Hawaiian islands]] are thought to have arrived between 300 and 800 CE, with European arrival in the 16th century. Hawaii is notable for its [[Endemism in the Hawaiian Islands|endemism]] of plants, [[Endemic birds of Hawaii|birds]], insects, mollusks and [[List of fish of Hawaii|fish]]; 30% of its organisms are endemic. Many of its species are endangered or have gone extinct, primarily due to accidentally introduced species and livestock grazing. Over 40% of its bird species have gone extinct, and it is the location of 75% of extinctions in the United States.<ref>{{Cite journal|date=22 November 2005|title=Controlling Ungulate Populations in native ecosystems in Hawaii|url=http://www.hawaiiconservation.org/images/uploads/resources/ungulates.pdf|url-status=dead|journal=Hawaii Conservation Alliance|archive-url=https://web.archive.org/web/20160508222953/http://www.hawaiiconservation.org/images/uploads/resources/ungulates.pdf|archive-date=2016-05-08}}</ref> Evidence suggests that the introduction of the Polynesian rat, above all other factors, drove the ecocide of the endemic forests of the archipelago.<ref>{{Cite journal |last1=Athens |first1=J. Stephen |last2=Toggle |first2=H. David |last3=Ward |first3=Jerome V. |last4=Welch |first4=David J. |date=14 November 2014 |title=Avifaunal extinctions, vegetation change, and Polynesian impacts in prehistoric Hawai'i |url=https://onlinelibrary.wiley.com/doi/10.1002/j.1834-4453.2002.tb00507.x |journal=[[Archaeology in Oceania]] |language=en |volume=37 |issue=2 |pages=57–78 |doi=10.1002/j.1834-4453.2002.tb00507.x |issn=0728-4896 |access-date=20 January 2024 |via=Wiley Online Library}}</ref> Extinction has increased in Hawaii over the last 200 years and is relatively well documented, with extinctions among native snails used as estimates for global extinction rates.<ref name="Phys.org-2015" />

=== Madagascar ===
{{Further|Wildlife of Madagascar|Subfossil lemur}}
[[File:Subfossil lemur C14 ranges.svg|thumb|upright=1.15|Radiocarbon dating of multiple subfossil specimens shows that now extinct [[Subfossil lemur|giant lemurs]] were present in Madagascar until after human arrival.]]
Within centuries of the arrival of [[Malagasy people|humans]] around the 1st millennium AD, nearly all of Madagascar's distinct, [[Endemism|endemic]], and [[Allopatric speciation|geographically isolated]] megafauna became extinct.<ref name="Hansford-2021">{{Cite journal |last1=Hansford |first1=James P. |last2=Lister |first2=Adrian M. |last3=Weston |first3=Eleanor M. |last4=Turvey |first4=Samuel T. |date=July 2021 |title=Simultaneous extinction of Madagascar's megaherbivores correlates with late Holocene human-caused landscape transformation |url=https://linkinghub.elsevier.com/retrieve/pii/S0277379121002031 |journal=Quaternary Science Reviews |language=en |volume=263 |pages=106996 |doi=10.1016/j.quascirev.2021.106996|bibcode=2021QSRv..26306996H |s2cid=236313083 }}</ref> The largest animals, of more than {{convert|150|kg|lbs}}, were extinct very shortly after the first human arrival, with large and medium-sized species dying out after prolonged hunting pressure from an expanding human population moving into more remote regions of the island around 1000 years ago. as well as 17 species of [[Subfossil lemur|"giant" lemurs]]. Some of these lemurs typically weighed over {{convert|150|kg|lbs}}, and their fossils have provided evidence of human butchery on many species.<ref>{{Cite journal|last1=Perez|first1=Ventura R.|last2=Godfrey|first2=Laurie R.|last3=Nowak-Kemp|first3=Malgosia|last4=Burney|first4=David A.|last5=Ratsimbazafy|first5=Jonah|last6=Vasey|first6=Natalia|date=2005-12-01|title=Evidence of early butchery of giant lemurs in Madagascar|journal=Journal of Human Evolution|volume=49|issue=6|pages=722–742|doi=10.1016/j.jhevol.2005.08.004|pmid=16225904}}</ref> Other megafauna present on the island included the [[Malagasy hippopotamus]]es as well as the large flightless [[elephant bird]]s, both groups are thought to have gone extinct in the interval 750–1050 CE.<ref name="Hansford-2021" /> Smaller fauna experienced initial increases due to decreased competition, and then subsequent declines over the last 500 years.<ref name="Crowley-2010" /> All fauna weighing over {{convert|10|kg|lbs}} died out. The primary reasons for the decline of Madagascar's biota, which at the time was already stressed by natural [[aridification]],<ref>{{cite journal |last1=Li |first1=Hanying |last2=Sinha |first2=Ashish |last3=André |first3=Aurèle Anquetil |last4=Spötl |first4=Christoph |last5=Vonhof |first5=Hubert B. |last6=Meunier |first6=Arnaud |last7=Kathayat |first7=Gayatri |last8=Duan |first8=Pengzhen |last9=Voarintsoa |first9=Ny Riavo G. |last10=Ning |first10=Youfeng |last11=Biswas |first11=Jayant |last12=Hu |first12=Peng |last13=Li |first13=Xianglei |last14=Sha |first14=Lijuan |last15=Zhao |first15=Jingyao |last16=Edwards |first16=R. Lawrence |last17=Cheng |first17=Hai |date=16 October 2020 |title=A multimillennial climatic context for the megafaunal extinctions in Madagascar and Mascarene Islands |journal=[[Science Advances]] |volume=6 |issue=42 |pages=1–13 |doi=10.1126/sciadv.abb2459 |pmid=33067226 |pmc=7567594 |bibcode=2020SciA....6.2459L |s2cid=222811671 }}</ref> were human hunting,<ref name="GodfreyEtAl2019" /><ref name="HixonEtAl2021">{{cite journal |last1=Hixon |first1=Sean W. |last2=Douglass |first2=Kristina G. |last3=Crowley |first3=Brooke E. |last4=Rakotozafy |first4=Lucien Marie Aimé |last5=Clark |first5=Geoffrey |last6=Anderson |first6=Atholl |last7=Haberle |first7=Simon |last8=Ranaivoarisoa |first8=Jean Freddy |last9=Buckley |first9=Michael |last10=Fidiarisoa |first10=Salomon |last11=Mbola |first11=Balzac |last12=Kennett |first12=Douglas J. |date=21 July 2021 |title=Late Holocene spread of pastoralism coincides with endemic megafaunal extinction on Madagascar |journal=Proceedings of the Royal Society B |volume=288 |issue=1955 |pages=1–10 |doi=10.1098/rspb.2021.1204 |pmid=34284627 |pmc=8292765 }}</ref> herding,<ref name="HixonEtAl2022">{{cite journal |last1=Hixon |first1=Sean W. |last2=Domic |first2=Alejandra I. |last3=Douglass |first3=Kristina G. |last4=Roberts |first4=Patrick |last5=Eccles |first5=Laurie |last6=Buckley |first6=Michael |last7=Ivory |first7=Sarah |last8=Noe |first8=Sarah |last9=Kennett |first9=Douglas J. |date=22 November 2022 |title=Cutmarked bone of drought-tolerant extinct megafauna deposited with traces of fire, human foraging, and introduced animals in SW Madagascar |journal=[[Scientific Reports]] |volume=12 |issue=1 |page=18504 |doi=10.1038/s41598-022-22980-w |pmid=36414654 |pmc=9681754 |bibcode=2022NatSR..1218504H }}</ref><ref name="HixonEtAl2021" /> farming,<ref name="GodfreyEtAl2019">{{cite journal |last1=Godfrey |first1=Laurie R. |last2=Scroxton |first2=Nick |last3=Crowley |first3=Brooke E. |last4=Burns |first4=Stephen J. |last5=Sutherland |first5=Michael R. |last6=Pérez |first6=Ventura R. |last7=Faina |first7=Peterson |last8=McGee |first8=David |last9=Ranivoharimanana |first9=Lovasoa |date=May 2019 |title=A new interpretation of Madagascar's megafaunal decline: The "Subsistence Shift Hypothesis" |journal=[[Journal of Human Evolution]] |volume=130 |pages=126–140 |doi=10.1016/j.jhevol.2019.03.002 |pmid=31010539 |s2cid=128362254 |doi-access=free }}</ref> and [[Deforestation in Madagascar|forest clearing]],<ref name="HixonEtAl2022" /> all of which persist and threaten Madagascar's remaining taxa today. The natural ecosystems of Madagascar as a whole were further impacted by the much greater incidence of fire as a result of anthropogenic fire production; evidence from Lake Amparihibe on the island of [[Nosy Be]] indicates a shift in local vegetation from intact rainforest to a fire-disturbed patchwork of grassland and woodland between 1300 and 1000 BP.<ref name="ReinhardtEtAl2022">{{cite journal |last1=Reinhardt |first1=Antonia L. |last2=Kasper |first2=Thomas |last3=Lochner |first3=Maximilian |last4=Bliedtner |first4=Marcel |last5=Krahn |first5=Kim J. |last6=Haberzettl |first6=Torsten |last7=Shumilovskikh |first7=Lyudmila |last8=Rahobisoa |first8=Jean-Jacques |last9=Zech |first9=Roland |last10=Favier |first10=Charly |last11=Behling |first11=Hermann |last12=Bremond |first12=Laurent |last13=Daut |first13=Gerhard |last14=Montade |first14=Vincent |date=4 February 2022 |title=Rain Forest Fragmentation and Environmental Dynamics on Nosy Be Island (NW Madagascar) at 1300 cal BP Is Attributable to Intensified Human Impact |journal=Frontiers in Ecology and Evolution |volume=9 |pages=1–21 |issn=2296-701X |doi=10.3389/fevo.2021.783770 |doi-access=free }}</ref>

=== New Zealand ===
{{Main|List of New Zealand animals extinct in the Holocene}}
{{See also|Biodiversity of New Zealand|Timeline of the New Zealand environment|Invasive species in New Zealand}}

[[New Zealand]] is characterized by its [[geographic isolation]] and [[Insular biogeography|island biogeography]], and had been isolated from mainland Australia for 80 million years. It was the last large land mass to be colonized by humans. The arrival of [[Polynesia]]n settlers in the late 13th century resulted in the extinction of all of the islands' megafaunal birds within several hundred years.<ref name="kolbert">{{Cite news|last=Kolbert|first=Elizabeth|date=2014-12-22|title=The Big Kill|newspaper=The New Yorker|url=https://www.newyorker.com/magazine/2014/12/22/big-kill|access-date=2016-02-25|issn=0028-792X}}</ref> The [[moa]], large flightless [[ratite]]s, were thriving during the Late Holocene,<ref>{{Cite journal |last1=Allentoft |first1=Morten Erik |last2=Heller |first2=Rasmus |last3=Oskam |first3=Charlotte L. |last4=Lorenzen |first4=Eline D. |last5=Hale |first5=Marie L. |last6=Gilbert |first6=M. Thomas P. |last7=Jacomb |first7=Christopher |last8=Holdaway |first8=Richard N. |last9=Bunce |first9=Michael |date=17 March 2014 |title=Extinct New Zealand megafauna were not in decline before human colonization |journal=[[Proceedings of the National Academy of Sciences of the United States of America]] |language=en |volume=111 |issue=13 |pages=4922–4927 |doi=10.1073/pnas.1314972111 |doi-access=free |issn=0027-8424 |pmc=3977255 |pmid=24639531 |bibcode=2014PNAS..111.4922A }}</ref> but became extinct within 200 years of the arrival of human settlers,<ref name="Perry-2014" /> as did the enormous [[Haast's eagle]], their primary predator, and at least two species of [[New Zealand goose|large, flightless geese]]. The Polynesians also introduced the [[Polynesian rat]]. This may have put some pressure on other birds but at the time of early European contact (18th century) and colonization (19th century) the bird life was prolific. With them, the Europeans brought various [[Invasive species in New Zealand|invasive species]] including [[Black rat|ship rat]]s, possums, cats and mustelids which devastated native bird life, some of which had adapted [[Flightless bird|flightlessness]] and ground nesting habits, and had no defensive behavior as a result of having no native mammalian predators. The [[kākāpō]], the world's biggest parrot, which is flightless, now only exists in managed breeding sanctuaries. New Zealand's national emblem, the [[Kiwi (bird)|kiwi]], is on the endangered bird list.<ref name="kolbert" />

==Mitigation==
{{Further|Nature conservation|Climate change mitigation}}{{multiple image
|align=right
|total_width=320
|image1=Climate March 1123 (34327144666).jpg
|caption1=[[People's Climate March (2017)|Climate March 2017]]
|image2=Extinction_Symbol.svg
|caption2=[[Extinction symbol]]
}}
Stabilizing [[World Population|human populations]];<ref>{{cite journal |last1=Crist|first1=Eileen |last2=Ripple|first2=William J.|last3= Ehrlich|first3=Paul R.|last4=Rees|first4=William E.|last5=Wolf |first5=Christopher |date=2022 |title=Scientists' warning on population|journal=Science of the Total Environment|volume=845|issue=|page=157166|doi=10.1016/j.scitotenv.2022.157166|s2cid=250387801 |pmid=35803428 |url=https://scientistswarning.forestry.oregonstate.edu/sites/default/files/Crist2022.pdf |bibcode=2022ScTEn.845o7166C}}</ref><ref>{{Cite book |last=Beebee |first=Trevor |title=Impacts of Human Population on Wildlife: A British Perspective |publisher=Cambridge University Press |year=2022 |isbn=978-1108833554}}</ref><ref>{{Cite journal |last1=Brashares |first1=Justin S. |last2=Arcese |first2=Peter |last3=Sam |first3=Moses K. |date=2001 |title=Human demography and reserve size predict wildlife extinction in West Africa |jstor=3067753 |journal=Proceedings: Biological Sciences |volume=268 |issue=1484 |pages=2473–2478|doi=10.1098/rspb.2001.1815 |pmid=11747566 |pmc=1088902 }}</ref> reining in [[capitalism]],<ref name="Hickel"/><ref name="Dawson"/><ref>{{Cite news |date=8 October 2020 |title=Attenborough: 'Curb excess capitalism' to save nature |work=BBC News |url=https://www.bbc.com/news/science-environment-54268038 |access-date=8 November 2022}}</ref> decreasing economic demands,<ref name="Crist2021"/><ref>{{Cite journal |vauthors=Büscher B, Fletcher R, Brockington D, Sandbrook C, Adams W, Campbell L, Corson C, Dressler W, Duffy R, Gray N, Holmes G, Kelly A, Lunstrum E, Ramutsindela M, Shanker K |date=2017 |title=Half-Earth or Whole Earth? Radical ideas for conservation, and their implications |journal=Oryx |volume=51 |issue=3 |pages=407–410 |doi=10.1017/S0030605316001228|s2cid=56573294 |doi-access=free }}</ref> and shifting them to economic activities with low impacts on biodiversity;<ref>{{cite journal |last1=Marques |first1=Alexandra |last2=Martins |first2=Inês S. |last3=Kastner |first3=Thomas |last4=Plutzar |first4=Christoph |last5=Theurl |first5=Michaela C. |last6=Eisenmenger |first6=Nina |last7=Huijbregts |first7=Mark A. J. |last8=Wood |first8=Richard |last9=Stadler |first9=Konstanin |last10=Bruckner |first10=Martin |last11=Canelas |first11=Joana |last12=Hilbers |first12=Jelle P. |last13=Tukker |first13=Arnold |last14=Erb |first14=Karlheinz |last15=Pereira |first15=Henrique M. |date=4 March 2019 |title=Increasing impacts of land use on biodiversity and carbon sequestration driven by population and economic growth |journal=[[Nature Ecology & Evolution]] |volume=3 |issue=4 |pages=628–637 |doi=10.1038/s41559-019-0824-3 |pmid=30833755 |pmc=6443044 |bibcode=2019NatEE...3..628M }}</ref> transitioning to [[plant-based diets]];<ref name="Plant-based"/><ref name="Machovina"/> and increasing the number and size of terrestrial and marine protected areas<ref>{{Cite journal |vauthors=Kopina H, Washington H, Gray J, Taylor B |date=2018 |title=The "future of conservation" debate: defending ecocentrism and the Nature Needs Half movement |journal=Biological Conservation |volume=217 |pages=140–148 |issn=0006-3207 |doi=10.1016/j.biocon.2017.10.016|s2cid=89930104 }}</ref><ref>{{Cite journal |vauthors=Noss R, Dobson A, Baldwin R, Beier P, Davis C, Dellasala D, Francis J, Locke H, Nowak K, Lopez R, Reining C, Trombulak S, Tabor G |date=2012 |title=Bolder thinking for conservation |journal=Conservation Biology |volume=26 |issue=1 |pages=1–4 |doi=10.1111/j.1523-1739.2011.01738.x|pmid=22280321 |s2cid=44550790 |doi-access=free |bibcode=2012ConBi..26....1N }}</ref> have been suggested to avoid or limit [[biodiversity loss]] and a possible sixth mass extinction. [[Rodolfo Dirzo]] and [[Paul R. Ehrlich]] suggest that "the one fundamental, necessary, 'simple' cure, ... is reducing the scale of the human enterprise."<ref name="Dirzo2022"/> According to a 2021 paper published in ''[[Frontiers in Conservation Science]]'', humanity almost certainly faces a "ghastly future" of mass extinction, biodiversity collapse, climate change and their impacts unless major efforts to change human industry and activity are rapidly undertaken.<ref name="Bradshaw2021"/><ref>{{cite news|last= Weston|first=Phoebe|date=January 13, 2021|title=Top scientists warn of 'ghastly future of mass extinction' and climate disruption|work=The Guardian |url=https://www.theguardian.com/environment/2021/jan/13/top-scientists-warn-of-ghastly-future-of-mass-extinction-and-climate-disruption-aoe|access-date=February 13, 2021}}</ref>

Reducing human population growth has been suggested as a means of mitigating climate change and the biodiversity crisis,<ref>{{cite journal |last1=O'Sullivan |first1=Jane N. |date=June 2020 |title=The social and environmental influences of population growth rate and demographic pressure deserve greater attention in ecological economics |url=https://www.sciencedirect.com/science/article/abs/pii/S0921800919310201 |journal=[[Ecological Economics (journal)|Ecological Economics]] |volume=172 |page=106648 |doi=10.1016/j.ecolecon.2020.106648 |s2cid=216368140 |access-date=5 January 2023}}</ref><ref>{{cite journal |last1=McKee |first1=Jeffrey K. |last2=Sciulli |first2=Paul W. |last3=Fooce |first3=C. David |last4=Waite |first4=Thomas A. |date=January 2004 |title=Forecasting global biodiversity threats associated with human population growth |url=https://www.sciencedirect.com/science/article/abs/pii/S0006320703000995 |journal=[[Biological Conservation (journal)|Biological Conservation]] |volume=115 |issue=1 |pages=161–164 |doi=10.1016/S0006-3207(03)00099-5 |bibcode=2004BCons.115..161M |access-date=3 January 2023}}</ref><ref name="CristEtAl2017">{{cite journal |last1=Crist |first1=Eileen |last2=Mora |first2=Camilo |last3=Engelman |first3=Robert |date=21 April 2017 |title=The interaction of human population, food production, and biodiversity protection |url=https://www.researchgate.net/publication/316286860 |journal=[[Science (journal)|Science]] |volume=356 |issue=6335 |pages=260–264 |doi=10.1126/science.aal2011 |pmid=28428391 |bibcode=2017Sci...356..260C |s2cid=12770178 |access-date=1 January 2023}}</ref> although many scholars believe it has been largely ignored in mainstream policy discourse.<ref>{{cite journal |last1=Dodson |first1=Jenna C. |last2=Dérer |first2=Patrícia |last3=Cafaro |first3=Philip |last4=Götmark |first4=Frank |date=15 December 2020 |title=Population growth and climate change: Addressing the overlooked threat multiplier |url=https://www.sciencedirect.com/science/article/abs/pii/S0048969720348750 |journal=[[Science of the Total Environment]] |volume=748 |page=141346 |doi=10.1016/j.scitotenv.2020.141346 |pmid=33113687 |bibcode=2020ScTEn.748n1346D |s2cid=225035992 |access-date=5 January 2023}}</ref><ref name="KopninaWashington2016">{{cite journal |last1=Kopnina |first1=Helen |last2=Washington |first2=Haydn |date=6 April 2016 |title=Discussing why population growth is still ignored or denied |journal=Chinese Journal of Population Resources and Environment |volume=14 |issue=2 |pages=133–143 |doi=10.1080/10042857.2016.1149296 |s2cid=155499197 |doi-access=free |bibcode=2016CJPSE..14..133K |hdl=1887/44662 |hdl-access=free }}</ref> An alternative proposal is greater agricultural efficiency & sustainability. Lots of non-arable land can be made into [[arable land]] good for growing food crops. Mushrooms have also been known to repair damaged soil.

A 2018 article in ''[[Science (journal)|Science]]'' advocated for the global community to designate [[30 by 30|30% of the planet by 2030]], and 50% by 2050, as [[protected area]]s in order to mitigate the contemporary extinction crisis. It highlighted that the human population is projected to grow to [[Projections of population growth#Up to 2050|10 billion by the middle of the century]], and consumption of food and water resources is projected to double by this time.<ref>{{cite journal|last1= Baillie|first1=Jonathan|last2=Ya-Ping |first2=Zhang|date=September 14, 2018|title=Space for nature|journal=Science|volume=361|issue=6407 |pages=1051|doi=10.1126/science.aau1397|pmid=30213888 |bibcode=2018Sci...361.1051B|doi-access=free}}</ref> A 2022 report published in ''[[Science (journal)|Science]]'' warned that 44% of earth's terrestrial surface, or {{convert|24.7|e6sqmi|e6km2|abbr=off|order=flip}}, must be conserved and made "ecologically sound" in order to prevent further biodiversity loss.<ref>{{cite journal |last1=Allan |first1=James R. |last2=Possingham |first2=Hugh P. |last3=Atkinson |first3=Scott C. |last4=Waldron |first4=Anthony |display-authors=etal. |title=The minimum land area requiring conservation attention to safeguard biodiversity |journal=Science |date=2 June 2022 |volume=376 |issue=6597 |pages=1094–1101 |doi=10.1126/science.abl9127 |pmid=35653463 |bibcode=2022Sci...376.1094A |hdl=11573/1640006 |s2cid=233423065|hdl-access=free }}</ref><ref>{{cite news |last=Magramo |first=Kathleen|date=June 3, 2022 |title=More than 40% of Earth's land surface must be conserved to stop the biodiversity crisis, report warns |work=CNN |url=https://www.cnn.com/2022/06/03/world/earth-conservation-report-intl-hnk-scn/index.html|access-date=June 8, 2022}}</ref>

In November 2018, the UN's biodiversity chief [[Cristiana Pașca Palmer]] urged people around the world to put pressure on governments to implement significant protections for wildlife by 2020. She called biodiversity loss a "silent killer" as dangerous as [[global warming]], but said it had received little attention by comparison. "It's different from climate change, where people feel the impact in everyday life. With biodiversity, it is not so clear but by the time you feel what is happening, it may be too late."<ref>{{cite news|last=Watts|first=Jonathan|date=November 3, 2018|title=Stop biodiversity loss or we could face our own extinction, warns UN |url=https://www.theguardian.com/environment/2018/nov/03/stop-biodiversity-loss-or-we-could-face-our-own-extinction-warns-un|work=The Guardian|access-date=November 3, 2018}}</ref> In January 2020, the UN [[Convention on Biological Diversity]] drafted a [[Paris Agreement|Paris-style]] plan to stop biodiversity and [[ecosystem collapse]] by setting the deadline of [[30 by 30|2030 to protect 30% of the earth's land and oceans]] and to reduce [[pollution]] by 50%, with the goal of allowing for the [[Ecosystem restoration|restoration of ecosystems]] by 2050. The world failed to meet the [[Aichi Biodiversity Targets|Aichi Biodiversity targets]] for 2020 set by the convention during a summit in Japan in 2010.<ref>{{cite news|last=Greenfield|first=Patrick|date=January 13, 2020|title=UN draft plan sets 2030 target to avert Earth's sixth mass extinction |url=https://www.theguardian.com/environment/2020/jan/13/un-draft-plan-sets-2030-target-to-avert-earths-sixth-mass-extinction-aoe|work=The Guardian|access-date=January 14, 2020}}</ref><ref>{{cite news|last=Yeung|first=Jessie |date=January 14, 2020|title=We have 10 years to save Earth's biodiversity as mass extinction caused by humans takes hold, UN warns|url=https://www.cnn.com/2020/01/14/world/un-biodiversity-draft-plan-intl-hnk-scli-scn/index.html|work=CNN|access-date=January 14, 2020}}</ref> Of the 20 biodiversity targets proposed, only six were "partially achieved" by the deadline.<ref>{{cite news|last=Dickie|first=Gloria|date=September 15, 2020 |title=Global Biodiversity Is in Free Fall|url=https://www.scientificamerican.com/article/global-biodiversity-is-in-free-fall/|work=[[Scientific American]]|access-date=September 15, 2020}}</ref> It was called a global failure by [[Inger Andersen (environmentalist)|Inger Andersen]], head of the [[United Nations Environment Programme]]:

{{blockquote|text="From [[COVID-19 pandemic|COVID-19]] to massive wildfires, floods, melting glaciers and unprecedented heat, our failure to meet the [[Convention on Biological Diversity|Aichi (biodiversity) targets]] — protect our our home — has very real consequences. We can no longer afford to cast nature to the side."<ref>{{cite news|last1=Larson|first1=Christina|last2=Borenstein|first2=Seth |date=September 15, 2020|title=World isn't meeting biodiversity goals, UN report finds|work=[[Associated Press]]|url=https://apnews.com/f2702a401da3b4c7617e4af7d7a6f2a3|access-date=September 15, 2020}}</ref>}}

Some scientists have proposed keeping extinctions below 20 per year for the next century as a global target to reduce species loss, which is the biodiversity equivalent of the 2 °C climate target, although it is still much higher than the normal background rate of two per year prior to anthropogenic impacts on the natural world.<ref>{{cite journal|vauthors=Rounsevell M, Harfoot M, Harrison P, Newbold T, Gregory R, Mace G |date=June 12, 2020|title=A biodiversity target based on species extinctions |url=https://discovery.ucl.ac.uk/id/eprint/10099553/|journal=Science|volume=368|issue=6496 |pages=1193–1195|doi=10.1126/science.aba6592 |pmid=32527821 |bibcode=2020Sci...368.1193R|s2cid=219585428 |via=UCL Discovery}}</ref><ref>{{cite journal|date=June 30, 2020|title=Fewer than 20 extinctions a year: does the world need a single target for biodiversity?|journal=[[Nature (journal)|Nature]]|volume=583|issue=7814 |pages=7–8 |doi=10.1038/d41586-020-01936-y|pmid=32606472|bibcode=2020Natur.583....7.|doi-access=free |department=Editorial}}</ref>

An October 2020 report on the "era of pandemics" from [[IPBES]] found that many of the same human activities that contribute to [[biodiversity loss]] and [[climate change]], including [[deforestation]] and the [[wildlife trade]], have also increased the risk of future [[pandemics]]. The report offers several policy options to reduce such risk, such as taxing [[meat]] production and consumption, cracking down on the illegal wildlife trade, removing high disease-risk species from the legal wildlife trade, and eliminating subsidies to businesses which are harmful to the environment.<ref name="Damien 102020">{{cite news|last=Carrington|first=Damian|date=October 29, 2020|title=Protecting nature is vital to escape 'era of pandemics' – report|url=https://www.theguardian.com/environment/2020/oct/29/protecting-nature-vital-pandemics-report-outbreaks-wild|work=The Guardian|access-date=November 28, 2020}}</ref><ref>{{cite news|last=Mcelwee|first=Pamela|date=November 2, 2020|title=COVID-19 and the biodiversity crisis |url=https://thehill.com/opinion/energy-environment/523944-covid-19-and-the-biodiversity-crisis|work=[[The Hill (newspaper)|The Hill]]|access-date=November 28, 2020}}</ref><ref name="IPBESPandemic">{{cite web|url=https://ipbes.net/pandemics|title=Escaping the 'Era of Pandemics': Experts Warn Worse Crises to Come Options Offered to Reduce Risk|author=<!--Not stated-->|date=2020|publisher=[[Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services]]|access-date=November 28, 2020}}</ref> According to marine zoologist John Spicer, "the [[COVID-19 pandemic|COVID-19 crisis]] is not just another crisis alongside the biodiversity crisis and the climate change crisis. Make no mistake, this is one big crisis – the greatest that humans have ever faced."<ref name="Damien 102020"/>

In December 2022, nearly every country on earth, with the [[United States]] and the [[Holy See]] being the only exceptions,<ref>{{cite news |last=Einhorn |first=Catrin |date=December 19, 2022|title= Nearly Every Country Signs On to a Sweeping Deal to Protect Nature|url=https://www.nytimes.com/2022/12/19/climate/biodiversity-cop15-montreal-30x30.html |work=[[The New York Times]]|location= |access-date=January 5, 2023|quote=The United States is just one of two countries in the world that are not party to the Convention on Biological Diversity, largely because Republicans, who are typically opposed to joining treaties, have blocked United States membership. That means the American delegation was required to participate from the sidelines. (The only other country that has not joined the treaty is the Holy See.)}}</ref> signed onto the [[Kunming-Montreal Global Biodiversity Framework]] agreement formulated at the [[2022 United Nations Biodiversity Conference]] (COP 15) which includes protecting 30% of land and oceans by 2030 and 22 other targets intended to mitigate the extinction crisis. The agreement is weaker than the [[Convention on Biological Diversity|Aichi Targets]] of 2010.<ref name="Paddison">{{cite news |last=Paddison|first=Laura |date=December 19, 2022 |title=More than 190 countries sign landmark agreement to halt the biodiversity crisis|url=https://www.cnn.com/2022/12/19/world/cop15-biodiversity-agreement-montreal-climate-scn-intl/index.html|work=CNN |location= |access-date=January 5, 2023}}</ref><ref>{{cite news |last=Curry |first=Tierra |date=December 24, 2022|title=COP15 biodiversity summit: Paving the road to extinction with good intentions|url=https://thehill.com/opinion/energy-environment/3787000-cop15-biodiversity-summit-paving-the-road-to-extinction-with-good-intentions/|work=[[The Hill (newspaper)|The Hill]] |location= |access-date=January 5, 2023}}</ref> It was criticized by some countries for being rushed and not going far enough to protect endangered species.<ref name="Paddison"/>

==See also==
{{portal|border=no|Biology|Ecology|Environment|World}}
{{div col|colwidth=18em}}
* [[Anthropocene]]
* [[Biodiversity loss]]
* [[Ecocide]]
* [[Extinction Rebellion]]
* [[Extinction risk from climate change]]
* [[Extinction symbol]]
* [[Extinction: The Facts|''Extinction: The Facts'' (2020 documentary)]]
* [[Human impact on the environment]]
* [[Lists of extinct species]]
* [[Pleistocene rewilding]]
* [[Quaternary extinction]]
* [[Racing Extinction|''Racing Extinction'' (2015 documentary film)]]
* [[Timeline of extinctions in the Holocene]]
* [[World Scientists' Warning to Humanity]]

{{div col end}}

==Notes==
{{notelist}}

==References==
{{Reflist|30em}}

==Further reading==
{{refbegin|30em}}
*{{cite book|last1=Ceballos|first1=Gerardo|last2= Ehrlich|first2=Anne H.|last3= Ehrlich|first3=Paul R.|author-link3=Paul R. Ehrlich| date= 2015|title=The Annihilation of Nature: Human Extinction of Birds and Mammals|url=https://jhupbooks.press.jhu.edu/content/annihilation-nature|location=Baltimore, Maryland|publisher=[[Johns Hopkins University Press]]|isbn=978-1421417189}}
*{{cite journal|last=deBuys|first=William|date=March 2015 |url=http://www.tomdispatch.com/post/175968/tomgram%3A_william_debuys%2C_a_global_war_on_nature/ |title=The Politics of Extinction – A Global War on Nature|journal=[[Tom Engelhardt|Tom Dispatch]] |quote=Uncounted species – not just tigers, gibbons, rhinos, and [[saola]], but vast numbers of smaller mammals, amphibians, birds, and reptiles – are being pressed to the brink. We’ve hardly met them and yet, within the vastness of the universe, they and the rest of Earth’s biota are our only known companions. Without them, our loneliness would stretch to infinity.}}
*{{cite journal|vauthors=Firestone RB, West A, Kennett JP, Becker L, Bunch TE, Revay ZS, Schultz PH, Belgya T, Kennett DJ, Erlandson JM, Dickenson OJ, Goodyear AC, Harris RS, Howard GA, Kloosterman JB, Lechler P, Mayewski PA, Montgomery J, Poreda R, Darrah T, Hee SS, Smith AR, Stich A, Topping W, Wittke JH, Wolbach WS|display-authors=6|title=Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=104|issue=41|pages=16016–16021 |date=October 2007|pmid=17901202|pmc=1994902|doi=10.1073/pnas.0706977104 |bibcode=2007PNAS..10416016F|doi-access=free}} 
*{{cite journal |last1=Hughes|first1=Emma C. |last2= Edwards|first2=David P.|last3=Thomas|first3=Gavin H.|date=2022 |title=The homogenization of avian morphological and phylogenetic diversity under the global extinction crisis|url= |journal=[[Current Biology]]|volume= 32|issue= 17|pages= 3830–3837.e3|doi=10.1016/j.cub.2022.06.018|pmid=35868322 |pmc=9616725 |s2cid=247827456 }}
*{{cite magazine|last=Kolbert|first=Elizabeth|date=May 25, 2009|author-link=Elizabeth Kolbert|title=The Sixth Extinction? There have been five great die-offs in history. This time, the cataclysm is us|magazine=[[The New Yorker]]|url= http://www.newyorker.com/reporting/2009/05/25/090525fa_fact_kolbert|access-date=8 May 2012}}
*{{cite book|title=The Sixth Extinction: Patterns of Life and the Future of Humankind|last=Leakey|first=Richard|author-link=Richard Leakey|author2=Lewin, Roger|author-link2=Roger Lewin |year=1996|publisher=[[Anchor Books]]|location=New York|isbn=978-0-385-46809-1}}
*{{cite journal|last1=Lees|first1=Alexander C.|last2=Attwood|first2=Simon|display-authors=etal.|date=2020|title=Biodiversity scientists must fight the creeping rise of extinction denial|journal=[[Nature Ecology and Evolution]]|volume=4|issue=11|pages=1440–1443|doi=10.1038/s41559-020-01285-z|pmid=32811999|s2cid=221167551|doi-access=free|bibcode=2020NatEE...4.1440L }}
*{{cite journal|last=Loarie|first=Scott R.|author2=Duffy, Philip B.|author3=Hamilton, Healy|author4=Asner, Gregory P.|author5=Field, Christopher B.|author6= Ackerly, David D.|title=The velocity of climate change|journal=Nature|year=2009|volume=462|issue=7276|pages=1052–1055|doi=10.1038/nature08649|pmid=20033047|bibcode=2009Natur.462.1052L|s2cid=4419902}}
*{{cite news|last=Marsh|first=Bill|title=Are We in the Midst Of a Sixth Mass Extinction?|url=https://www.nytimes.com/interactive/2012/06/01/opinion/sunday/are-we-in-the-midst-of-a-sixth-mass-extinction.html|newspaper=The New York Times Sunday Review: Opinion Page|date=1 June 2012|access-date=18 October 2012}}
*{{cite book|title=Pleistocene Extinctions: The Search for a Cause|editor-last=Martin|editor-first=P. S.|editor2=Wright, H. E. Jr|year=1967|publisher=[[Yale University Press]]|location=New Haven|isbn=978-0-300-00755-8}}
*{{cite journal|last=McCallum, Malcolm L.|title=Vertebrate biodiversity losses point to sixth mass extinction|journal=Biodiversity and Conservation|year=2015|volume=24|issue=10|pages=2497–2519|doi=10.1007/s10531-015-0940-6 |bibcode=2015BiCon..24.2497M |s2cid=16845698}}
*{{cite book|last=Newman|first=Lenore|title=Lost Feast: Culinary Extinction and the Future of Food|year=2019|isbn=978-1770414358|publisher=ECW Press}}
*{{cite news|last=Nihjuis|first=Michelle|title=Conservationists Use Triage to Determine Which Species to Save and Not|date=23 July 2012|newspaper=Scientific American}}
*{{cite book|author=Oakes, Ted|title=Land of Lost Monsters: Man Against Beast – The Prehistoric Battle for the Planet|publisher=Hylas Publishing|year=2003|isbn=978-1-59258-005-7 |url=https://archive.org/details/landoflostmonste00tedo}}
* {{cite book|title=Inheritors of the Earth: How Nature Is Thriving in an Age of Extinction|first=Chris D.|last=Thomas|publisher=PublicAffairs|year=2017|isbn=978-1610397278}}
* {{Cite journal|last=Wiens|first=John J.|date=December 2016|title =Climate-Related Local Extinctions Are Already Widespread among Plant and Animal Species|journal=[[PLOS Biology]]|volume=14|issue=12 |pages=e2001104 |doi=10.1371/journal.pbio.2001104|pmid=27930674|pmc=5147797|hdl=10150/622757 |doi-access=free }}
{{refend}}

==External links==
{{external media
|float=right
|width=220px
|video1= {{YouTube|z9gHuAwxwAs|Are We Living In the Sixth Extinction?}}
|video2={{YouTube|dbCR0KSU52g|We need IMMEDIATE action to stop extinction crisis, David Attenborough - BBC}}
|video3={{YouTube|6TqhcZsxrPA|Earth currently experiencing a sixth mass extinction, according to scientists}}}}
*[http://www.biologicaldiversity.org/programs/biodiversity/elements_of_biodiversity/extinction_crisis/ The Extinction Crisis] {{Webarchive|url=https://web.archive.org/web/20190903122445/https://www.biologicaldiversity.org/programs/biodiversity/elements_of_biodiversity/extinction_crisis/ |date=2019-09-03 }}. [[Center for Biological Diversity]].
*[http://edition.cnn.com/interactive/2016/12/specials/vanishing/ Vanishing: The extinction crisis is far worse than you think]. [[CNN]]. December 2016.
*[https://www.theguardian.com/environment/2017/feb/25/half-all-species-extinct-end-century-vatican-conference Biologists say half of all species could be extinct by end of century], ''The Guardian,'' 25 February 2017
*[https://www.independent.co.uk/environment/mass-extinction-humans-causing-earth-deaths-end-times-warning-a7765856.html Humans are ushering in the sixth mass extinction of life on Earth, scientists warn], ''The Independent,'' 31 May 2017
*[http://www.cbc.ca/news/thenational/national-today-newsletter-russia-diplomats-biodiversity-1.4592950 Human activity pushing Earth towards 'sixth mass species extinction,' report warns]. CBC. Mar 26, 2018
*[https://www.theguardian.com/environment/2018/oct/04/terror-being-waged-on-wildlife-leaders-warn 'Terror being waged on wildlife', leaders warn]. ''The Guardian.'' October 4, 2018.
*[https://www.discovermagazine.com/planet-earth/earth-is-on-the-cusp-of-the-sixth-mass-extinction-heres-what-paleontologists  Earth Is on the Cusp of the Sixth Mass Extinction. Here's What Paleontologists Want You to Know]. ''[[Discover (magazine)|Discover]]''. December 3, 2020.
*[https://www.thenation.com/article/environment/extinct-species-2022/ What the Extinction Crisis Took From the World in 2022]. ''[[The Nation]]''. December 22, 2022.
*[https://www.reuters.com/lifestyle/science/extinction-crisis-puts-1-million-species-brink-2022-12-23/ Extinction crisis puts 1 million species on the brink]. [[Reuters]]. December 23, 2022.
*[https://www.reuters.com/business/environment/huge-chunk-plants-animals-us-risk-extinction-report-2023-02-06/ Exclusive: Huge chunk of plants, animals in U.S. at risk of extinction]. Reuters. February 6, 2023.

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{{DEFAULTSORT:Holocene Extinction}}
[[Category:Holocene extinctions| ]]
[[Category:Species made extinct by human activities|Species made extinct by human activities]]
[[Category:Extinction]]
[[Category:Holocene|Extinction]]
[[Category:Holocene life|Extinction]]
[[Category:Environmental impact by effect]]
[[Category:Human ecology]]
[[Category:Human impact on the environment]]
[[Category:Anthropocene]]
[[Category:Extinction events]]

[[hu:Pleisztocén-holocén becsapódási esemény]]
{{Навигационная таблица/Портал/Английская Википедия}}
[[Категория:Английская Википедия]]
[[Категория:Википедия]]
[[Категория:Статья из Википедии]]
[[Категория:Статья из Английской Википедии]]