United States

=== Biodiversity and conservation ===
{{Main|Fauna of the United States|Flora of the United States}}
{{Anchor|Wildlife and conservation}}
[[File:Bald eagle about to fly in Alaska (2016).jpg|alt=A bald eagle|thumb|The [[bald eagle]], the [[national bird of the United States]] since 1782<ref name="McDougall2004">{{cite book|first=Len|last=McDougall|title=The Encyclopedia of Tracks and Scats: A Comprehensive Guide to the Trackable Animals of the United States and Canada|url=https://books.google.com/books?id=9XOc2_u7z6cC&pg=PA325|year=2004|publisher=Lyons Press|isbn=978-1-59228-070-4|page=325}}</ref>]]

The U.S. is one of 17 [[megadiverse countries]] containing large numbers of [[List of endangered animals of North America|endemic species]]: about 17,000 species of [[vascular plant]]s occur in the contiguous United States and Alaska, and over 1,800 species of [[flowering plant]]s are found in Hawaii, few of which occur on the mainland.<ref>{{cite web|author=Morin, Nancy|url=https://www.fungaljungal.org/papers/National_Biological_Service.pdf|archive-url=https://web.archive.org/web/20130724222726/https://www.fungaljungal.org/papers/National_Biological_Service.pdf|title=Vascular Plants of the United States|website=Plants|publisher=National Biological Service|access-date=October 27, 2008|archive-date=July 24, 2013}}</ref> The United States is home to 428 [[mammal]] species, 784 birds, 311 reptiles, 295 [[amphibian]]s,<ref name="Current Results # of native species in the US">{{cite web|last1=Osborn|first1=Liz|title=Number of Native Species in United States|url=https://www.currentresults.com/Environment-Facts/Plants-Animals/number-of-native-species-in-united-states.php|publisher=Current Results Nexus|access-date=January 15, 2015}}</ref> and 91,000 insect species.<ref>{{cite web|url=https://www.si.edu/Encyclopedia_SI/nmnh/buginfo/bugnos.htm|title=Numbers of Insects (Species and Individuals)|publisher=Smithsonian Institution|access-date=January 20, 2009}}</ref>

There are 63 [[List of national parks of the United States|national parks]], and [[Federal lands|hundreds of other federally managed]] parks, forests, and [[National Wilderness Preservation System|wilderness areas]], managed by the [[National Park Service]] and other agencies.<ref>{{cite web|title= National Park FAQ|url=https://www.nps.gov/aboutus/national-park-system.htm/|website=nps|publisher=National Park Service|access-date=May 8, 2015}}</ref> About 28% of the country's land is publicly owned and federally managed,<ref name="NYTimes Federal Land">{{cite news|last1=Lipton|first1=Eric|last2=Krauss|first2=Clifford|title=Giving Reins to the States Over Drilling|url=https://www.nytimes.com/2012/08/24/us/romney-would-give-reins-to-states-on-drilling-on-federal-lands.html?pagewanted=2&_r=0|access-date=January 18, 2015|newspaper=The New York Times|date=August 23, 2012}}</ref> primarily in the [[Western United States|western states]].<ref name="AKLeg CRS Federal Land">{{Cite report|url=https://www.akleg.gov/basis/get_documents.asp?session=31&docid=47224|title=Federal Land Ownership: Overview and Data|publisher=Congressional Research Service|date=March 3, 2017|access-date=June 18, 2020|last1=Vincent|first1=Carol H.|last2=Hanson|first2=Laura A.|last3=Argueta|first3=Carla N.|page=2}}</ref> Most of this land is [[Protected areas of the United States|protected]], though some is leased for commercial use, and less than one percent is used for military purposes.<ref name="Federal Land Ownership">{{cite web|last1=Gorte|first1=Ross W.|last2=Vincent|first2=Carol Hardy.|last3=Hanson|first3=Laura A.|last4=Marc R.|first4=Rosenblum|title=Federal Land Ownership: Overview and Data|url=https://fas.org/sgp/crs/misc/R42346.pdf|website=fas.org|publisher=Congressional Research Service|access-date=January 18, 2015}}</ref><ref name="Fed Land Uses">{{cite web|title=Chapter 6: Federal Programs to Promote Resource Use, Extraction, and Development|url=https://www.doi.gov/pmb/oepc/wetlands2/v2ch6.cfm|website=doi.gov|archive-url=https://web.archive.org/web/20150318005744/https://www.doi.gov/pmb/oepc/wetlands2/v2ch6.cfm|publisher=U.S. Department of the Interior|access-date=January 19, 2015|archive-date=March 18, 2015}}</ref>

[[Environmental issues in the United States]] include debates on [[non-renewable resource]]s and [[Nuclear power debate|nuclear energy]], [[Pollution prevention in the US|air and water pollution]], [[biodiversity]], logging and [[Deforestation in the United States|deforestation]],<ref>{{cite web|author=The National Atlas of the United States of America|url=https://www.nationalatlas.gov/articles/biology/a_forest.html|title=Forest Resources of the United States|publisher=Nationalatlas.gov|date=January 14, 2013|access-date=January 13, 2014|archive-url=https://web.archive.org/web/20090507195541/https://www.nationalatlas.gov/articles/biology/a_forest.html|archive-date=May 7, 2009 }}</ref><ref>{{cite web|url=https://www.fs.fed.us/pnw/pubs/gtr587.pdf|title=Land Use Changes Involving Forestry in the United States: 1952 to 1997, With Projections to 2050|year=2003|access-date=January 13, 2014}}</ref> and [[Climate change in the United States|climate change]].<ref>[[#Daynes|Daynes & Sussman, 2010]], pp. 3, 72, 74–76, 78</ref><ref>Hays, Samuel P. (2000). ''A History of Environmental Politics since 1945''.</ref> The [[United States Environmental Protection Agency|U.S. Environmental Protection Agency]] (EPA) is the federal agency charged with [[Environmental policy of the United States|addressing most environmental-related issues]].<ref name="Collin2006">{{cite book|last=Collin|first=Robert W.|title=The Environmental Protection Agency: Cleaning Up America's Act|url=https://books.google.com/books?id=OVPoqXeTYTwC&pg=PA1|year=2006|publisher=Greenwood Publishing Group|isbn=978-0-313-33341-5|page=1|access-date=October 25, 2015}}</ref> The [[National Wilderness Preservation System|idea of wilderness]] has shaped the management of public lands since 1964, with the [[Wilderness Act]].<ref>Turner, James Morton (2012). ''The Promise of Wilderness'', pp. 29&ndash;32</ref> The [[Endangered Species Act of 1973]] provides a way to protect threatened and endangered species and their habitats. The [[United States Fish and Wildlife Service]] implements and enforces the Act.<ref name="Office">{{cite book|title=Endangered species Fish and Wildlife Service|url=https://books.google.com/books?id=a8BEuUPJb58C&pg=PA1|publisher=General Accounting Office, Diane Publishing|isbn=978-1-4289-3997-4|pages=1–3, 42|access-date=October 25, 2015|year=2003 }}</ref> {{As of|2022}}, the U.S. ranked 43rd among 180 countries in the [[Environmental Performance Index]].<ref>{{Cite web|url=https://epi.yale.edu/epi-results/2022/component/epi|title=Environmental Performance Index &#124; Environmental Performance Index|website=epi.yale.edu}}</ref> The country joined the [[Paris Agreement]] on climate change in 2016 and has many other environmental commitments.<ref>{{cite web|title=United States of America|url=https://climateaction.unfccc.int/views/country.html?country=US|website=Global Climate Action – NAZCA|publisher=United Nations|access-date=November 18, 2020}}</ref>