Environment of the United States

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The United States is part of North America. LocationUSA.png
The United States is part of North America.

The environment of the United States comprises diverse biotas, climates, and geologies. This diversity leads to a number of different distinct regions and geographies in which human communities live. This includes a rich variety of species of animals, fungi, plants and other organisms.

Contents

Because of the strong forces of economic exploitation and industrialization, humans have had deep effects on the ecosystems of the United States, resulting in a number of environmental issues.

Since awareness of these issues emerged in the 1970s, environmental regulations and a growing environmental movement, including both climate movement and the environmental justice movement have emerged to respond to the various threats to the environment. These movements are intertwined with a long history of conservation, starting in the early 19th century, that has resulted in a robust network of protected areas, including 28.8% of land managed by the Federal government.

Biota

Bioregions of Northern America, according to one scheme. A map of North America's bioregions, improved from the previous.jpg
Bioregions of Northern America, according to one scheme.

Animals

There are about 21,717 different species of native plants and animals in the United States. More than 400 mammal, 700 bird, 500 reptile and amphibian, and 90,000 insect species have been documented. [1] Wetlands, such as the Florida Everglades, are the base for much of this diversity. There are over 140,000 invertebrates in the United States which is constantly growing as researchers identify more species. Fish are the largest group of animal species, with over one thousand counted so far. About 13,000 species are added to the list of known organisms each year. [2]

Fungi

Around 14,000 species of fungi were listed by Farr, Bills, Chamuris and Rossman in 1989. [3] Still, this list only included terrestrial species. It did not include lichen-forming fungi, fungi on dung, freshwater fungi, marine fungi or many other categories. Fungi are essential to the survival of many groups of organisms.

Plants

With habitats ranging from tropical to Arctic, U.S. plant life is very diverse. The country has more than 17,000 identified native species of flora, including 5,000 in California (home to the tallest, the most massive, and the oldest trees in the world). [4] Three quarters of the United States species consist of flowering plants.

Human impacts on biota

The country's ecosystems include thousands of non-native exotic species that often harm indigenous communities of living things. Many indigenous species became extinct soon after the first human settlement, including the North American megafauna; others have become nearly extinct since European settlement, among them the American bison and California condor. [5] Many plants and animals have declined dramatically as a result of massive conversion and other human activity.

Climate

Koppen climate types of the US US 50 states Koppen.svg
Köppen climate types of the US

The U.S. climate is temperate in most areas, tropical in Hawaii and southern Florida, polar in Alaska, semiarid in the Great Plains west of the 100th meridian, Mediterranean in coastal California and arid in the Great Basin. Its comparatively generous climate contributed (in part) to the country's rise as a world power, with infrequent severe drought in the major agricultural regions, a general lack of widespread flooding, and a mainly temperate climate that receives adequate precipitation.

Following World War II, cities in the southern and western region experienced an economic and population boom. The population growth in the Southwest, has strained water and power resources, with water diverted from agricultural uses to major population centers, such as Las Vegas and Los Angeles. According to the California Department of Water Resources, if more supplies are not found by 2020, residents will face a water shortfall nearly as great as the amount consumed today. [6]

The United States mainland contains a total of seven distinct regional climates. Those include high elevation Northwestern region, the Pacific Northwest, the High plains, Midwest/Ohio valley/New England, Mid Atlantic/Southeast, Southern region, and Southwestern region. Each region contains different states and has their own climate and temperatures throughout the year. [7]

Geology

This section is an excerpt from Geology of the United States.[ edit ]
Shaded relief map of the United States, showing 10 geological provinces US Geological Provinces.gif
Shaded relief map of the United States, showing 10 geological provinces
The richly textured landscape of the United States is a product of the dueling forces of plate tectonics, weathering and erosion. Over the 4.5 billion-year history of the Earth, tectonic upheavals and colliding plates have raised great mountain ranges while the forces of erosion and weathering worked to tear them down. Even after many millions of years, records of Earth's great upheavals remain imprinted as textural variations and surface patterns that define distinctive landscapes or provinces. [8]

Environmental law and conservation

The nation's major environmental laws were enacted between 1969 and 1980:

The Endangered Species Act of protects threatened and endangered species and their habitats, which are monitored by the U.S. Fish and Wildlife Service.

Protected areas

United States National Marine Sanctuaries US National Marine Sanctuary global system map.gif
United States National Marine Sanctuaries

The United States maintains national parks as well as other preservation areas, such as the Florida Everglades. There are more than 400 protected sites spread across 84 million acres but very few are large enough to contain ecosystems.

In 1872, the world's first national park was established at Yellowstone. Another fifty-seven national parks and hundreds of other federally managed parks and forests have since been formed. [9] Wilderness areas have been established around the country to ensure long-term protection of pristine habitats. Altogether, the U.S. government regulates 1,020,779 square miles (2,643,807 km2), 28.8% of the country's total land area. [10] Protected parks and forestland constitute most of this. As of March 2004, approximately 16% of public land under Bureau of Land Management administration was being leased for commercial oil and natural gas drilling; [11] public land is also leased for mining and cattle ranching.

Environmental issues

This section is an excerpt from Environmental issues in the United States.[ edit ]
Of the major greenhouse gas emitting nations, the U.S. is among the highest per person emitters. 20210626 Variwide chart of greenhouse gas emissions per capita by country.svg
Of the major greenhouse gas emitting nations, the U.S. is among the highest per person emitters.
Annual CO2 emissions, total by country (2017 data) shows the U.S. trails China in total annual emissions (not per capita). Annual CO2 emissions, OWID.svg
Annual CO2 emissions, total by country (2017 data) shows the U.S. trails China in total annual emissions (not per capita).
Environmental issues in the United States include climate change, energy, species conservation, invasive species, deforestation, mining, nuclear accidents, pesticides, pollution, waste and over-population. Despite taking hundreds of measures, the rate of environmental issues is increasing rapidly instead of reducing. The United States is among the most significant emitters of greenhouse gasses in the world. In terms of both total and per capita emissions, it is among the largest contributors. [13] The climate policy of the United States has a major influence on the world. [14] [15]

Climate change

This section is an excerpt from Climate change in the United States.[ edit ]
Geographic extent of warming: Average temperatures in almost all regions in the U.S. have increased in the last 120 years. 1900- Temperature change in the United States (color-coded map).png
Geographic extent of warming: Average temperatures in almost all regions in the U.S. have increased in the last 120 years.
Warming over time: Annual temperatures averaged across the U.S. have exceeded the 1971-2000 average almost every year in the 21st century. 1895- Temperature change in the United States - Ed Hawkins - climate change.jpg
Warming over time: Annual temperatures averaged across the U.S. have exceeded the 1971–2000 average almost every year in the 21st century.

Climate change has led to the United States warming by 2.6 °F (1.4 °C) since 1970. [18] The climate of the United States is shifting in ways that are widespread and varied between regions. [19] [20] From 2010 to 2019, the United States experienced its hottest decade on record. [21] Extreme weather events, invasive species, floods and droughts are increasing. [22] [23] [24] Climate change's impacts on tropical cyclones and sea level rise also affects regions of the country.

Cumulatively since 1850, the U.S. has emitted a larger share than any country of the greenhouse gases causing current climate change, with some 20% of the global total of carbon dioxide alone. [25] Current US emissions per person are among the largest in the world. [26] Various state and federal climate change policies have been introduced, and the US has ratified the Paris Agreement despite temporarily withdrawing. In 2021, the country set a target of halving its annual greenhouse gas emissions by 2030, [27] however oil and gas companies still get tax breaks. [28]

Climate change is having considerable impacts on the environment and society of the United States. This includes implications for agriculture, the economy (especially the affordability and availability of insurance), human health, and indigenous peoples, and it is seen as a national security threat. [29] States that emit more carbon dioxide per person and introduce policies to oppose climate action are generally experiencing greater impacts. [30] [31] 2020 was a historic year for billion-dollar weather and climate disasters in U.S. [32]

Although historically a non-partisan issue, climate change has become controversial and politically divisive in the country in recent decades. Oil companies have known since the 1970s that burning oil and gas could cause global warming but nevertheless funded deniers for years. [33] [34] Despite the support of a clear scientific consensus, as recently as 2021 one-third of Americans deny that human-caused climate change exists [35] although the majority are concerned or alarmed about the issue. [36]

Conservation

This section is an excerpt from Conservation in the United States.[ edit ]
Yosemite National Park Yosemite 2.jpg
Yosemite National Park

Conservation in the United States can be traced back to the 19th century with the formation of the first National Park. Conservation generally refers to the act of consciously and efficiently using land and/or its natural resources. This can be in the form of setting aside tracts of land for protection from hunting or urban development, or it can take the form of using less resources such as metal, water, or coal. Usually, this process of conservation occurs through or after legislation on local or national levels is passed.

Conservation in the United States, as a movement, began with the American sportsmen who came to the realization that wanton waste of wildlife and their habitat had led to the extinction of some species, while other species were at risk. John Muir and the Sierra Club started the modern movement, history shows that the Boone and Crockett Club, formed by Theodore Roosevelt, spearheaded conservation in the United States. [37]

While conservation and preservation both have similar definitions and broad categories, preservation in the natural and environmental scope refers to the action of keeping areas the way they are and trying to dissuade the use of its resources; conservation may employ similar methods but does not call for the diminishing of resource use but rather calls for a responsible way of going about it. A distinction between Sierra Club and Boone and Crockett Club is that Sierra Club was and is considered a preservationist organization whereas Boone and Crockett Club endorses conservation, simply defined as an "intelligent use of natural resources." [38]


See also

Related Research Articles

<span class="mw-page-title-main">Pollutant</span> Substance or energy damaging to the environment

A pollutant or novel entity is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource. These can be both naturally forming or anthropogenic in origin. Pollutants result in environmental pollution or become public health concerns when they reach a concentration high enough to have significant negative impacts.

<span class="mw-page-title-main">Environmental protection</span> Practice of protecting the natural environment

Environmental protection is the practice of protecting the natural environment by individuals, groups and governments. Its objectives are to conserve natural resources and the existing natural environment and, where it is possible, to repair damage and reverse trends.

<span class="mw-page-title-main">Environmental disaster</span> Disaster to the natural environment due to human activity

An environmental disaster or ecological disaster is defined as a catastrophic event regarding the natural environment that is due to human activity. This point distinguishes environmental disasters from other disturbances such as natural disasters and intentional acts of war such as nuclear bombings.

<span class="mw-page-title-main">Human impact on the environment</span> Impact of human life on Earth and environment

Human impact on the environment refers to changes to biophysical environments and to ecosystems, biodiversity, and natural resources caused directly or indirectly by humans. Modifying the environment to fit the needs of society is causing severe effects including global warming, environmental degradation, mass extinction and biodiversity loss, ecological crisis, and ecological collapse. Some human activities that cause damage to the environment on a global scale include population growth, neoliberal economic policies and rapid economic growth, overconsumption, overexploitation, pollution, and deforestation. Some of the problems, including global warming and biodiversity loss, have been proposed as representing catastrophic risks to the survival of the human species.

The Climate Change Science Program (CCSP) was the program responsible for coordinating and integrating research on global warming by U.S. government agencies from February 2002 to June 2009. Toward the end of that period, CCSP issued 21 separate climate assessment reports that addressed climate observations, changes in the atmosphere, expected climate change, impacts and adaptation, and risk management issues. Shortly after President Obama took office, the program's name was changed to U.S. Global Change Research Program (USGCRP) which was also the program's name before 2002. Nevertheless, the Obama Administration generally embraced the CCSP products as sound science providing a basis for climate policy. Because those reports were mostly issued after the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), and in some cases focused specifically on the United States, they were generally viewed within the United States as having an importance and scientific credibility comparable to the IPCC assessments for the first few years of the Obama Administration.

<span class="mw-page-title-main">Greenhouse gas emissions by the United States</span> Climate changing gases from the North American country

The United States produced 5.2 billion metric tons of carbon dioxide equivalent greenhouse gas (GHG) emissions in 2020, the second largest in the world after greenhouse gas emissions by China and among the countries with the highest greenhouse gas emissions per person. In 2019 China is estimated to have emitted 27% of world GHG, followed by the United States with 11%, then India with 6.6%. In total the United States has emitted a quarter of world GHG, more than any other country. Annual emissions are over 15 tons per person and, amongst the top eight emitters, is the highest country by greenhouse gas emissions per person.

<span class="mw-page-title-main">Environmental issues in the United States</span>

Environmental issues in the United States include climate change, energy, species conservation, invasive species, deforestation, mining, nuclear accidents, pesticides, pollution, waste and over-population. Despite taking hundreds of measures, the rate of environmental issues is increasing rapidly instead of reducing. The United States is among the most significant emitters of greenhouse gasses in the world. In terms of both total and per capita emissions, it is among the largest contributors. The climate policy of the United States has a major influence on the world.

Environmental issues in Canada include impacts of climate change, air and water pollution, mining, logging, and the degradation of natural habitats. As one of the world's significant emitters of greenhouse gasses, Canada has the potential to make contributions to curbing climate change with its environmental policies and conservation efforts.

<span class="mw-page-title-main">Environmental policy of the United States</span> Governmental action to protect the environment

The environmental policy of the United States is a federal governmental action to regulate activities that have an environmental impact in the United States. The goal of environmental policy is to protect the environment for future generations while interfering as little as possible with the efficiency of commerce or the liberty of the people and to limit inequity in who is burdened with environmental costs. As his first official act bringing in the 1970s, President Richard Nixon signed the U.S. National Environmental Policy Act (NEPA) into law on New Years Day, 1970. Also in the same year, America began celebrating Earth Day, which has been called "the big bang of U.S. environmental politics, launching the country on a sweeping social learning curve about ecological management never before experienced or attempted in any other nation." NEPA established a comprehensive US national environmental policy and created the requirement to prepare an environmental impact statement for "major federal actions significantly affecting the quality of the environment." Author and consultant Charles H. Eccleston has called NEPA the world's "environmental Magna Carta".

<span class="mw-page-title-main">Climate change in the United States</span> Emissions, impacts and responses of the United States related to climate change

Climate change has led to the United States warming by 2.6 °F since 1970. The climate of the United States is shifting in ways that are widespread and varied between regions. From 2010 to 2019, the United States experienced its hottest decade on record. Extreme weather events, invasive species, floods and droughts are increasing. Climate change's impacts on tropical cyclones and sea level rise also affects regions of the country.

To protect the environment from the adverse effects of pollution, many nations worldwide have enacted legislation to regulate various types of pollution as well as to mitigate the adverse effects of pollution. At the local level, regulation usually is supervised by environmental agencies or the broader public health system. Different jurisdictions often have different levels regulation and policy choices about pollution. Historically, polluters will lobby governments in less economically developed areas or countries to maintain lax regulation in order to protect industrialisation at the cost of human and environmental health.

<span class="mw-page-title-main">Wetland conservation</span> Conservation of wet areas

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<span class="mw-page-title-main">Traditional ecological knowledge</span> Indigenous and other traditional knowledge of local resources

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<span class="mw-page-title-main">Environmental impact of the energy industry</span>

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This timeline of the history of environmentalism is a listing of events that have shaped humanity's perspective on the environment. This timeline includes human induced disasters, environmentalists that have had a positive influence, and environmental legislation.

The climate change policy of the United States has major impacts on global climate change and global climate change mitigation. This is because the United States is the second largest emitter of greenhouse gasses in the world after China, and is among the countries with the highest greenhouse gas emissions per person in the world. Cumulatively, the United States has emitted over a trillion metric tons of greenhouse gases, more than any country in the world.

The United States Environmental Protection Agency (EPA) began regulating greenhouse gases (GHGs) under the Clean Air Act from mobile and stationary sources of air pollution for the first time on January 2, 2011. Standards for mobile sources have been established pursuant to Section 202 of the CAA, and GHGs from stationary sources are currently controlled under the authority of Part C of Title I of the Act. The basis for regulations was upheld in the United States Court of Appeals for the District of Columbia in June 2012.

<span class="mw-page-title-main">Clean Power Plan</span> United States energy plan from President Obama

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<span class="mw-page-title-main">Climate change litigation</span> Use of legal practice to further climate change mitigation

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References

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  2. ↑ Number of Native Species in United States [ permanent dead link ]
  3. ↑ Farr, D.F, Bills, G.F., Chamuris, G.P. and Rossman, A.Y. "Fungi on Plants and Plant Products in the United States". 1252 pp., APS Press, St Paul Minnesota, USA, 1989
  4. ↑ Morse, L. E., Kartesz, J. T., & Kutner, L. S. (1995). "Native vascular plants". Our Living Resources: a report to the nation on the distribution, abundance, and health of US plants, animals and ecosystems. Washington, DC: US Department of the Interior, National Biological Service. pp. 205–209.{{cite book}}: CS1 maint: multiple names: authors list (link)
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    ● Data for 2020 is also presented in Popovich, Nadja; Plumer, Brad (November 12, 2021). "Who Has The Most Historical Responsibility for Climate Change?". The New York Times. Archived from the original on December 29, 2021.
    ● Source for country populations: "List of the populations of the world's countries, dependencies, and territories". britannica.com. Encyclopedia Britannica.
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