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10,000 years ago:  Agricultural revolution

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10,000 years ago:  Agricultural revolution

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Transcendentalist text that promoted the philosophy of living simply and in harmony with nature.

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The Homestead Act was a law in the early USA which allowed Americans to acquire ownership of government land or the public domain, typically called a homestead.

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1872:  Yellowstone National Park founded (1st national park)

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1872:  Yellowstone National Park founded (1st national park)

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1905:  U.S. forest Service founded + Gifford Pinchot

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1905:  U.S. forest Service founded + Gifford Pinchot

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Gifford Pinchot was an American forester and politician. He served as the 4th Chief of the U.S. Division of Forestry and as the 1st head of the United States Forest Service.

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Aldo Leopold was an American author, philosopher, naturalist, scientist, ecologist, forester, conservationist, and environmentalist. He was a professor at the University of Wisconsin and wrote A Sand County Almanac.

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The first United States law to provide general protection for any general kind of cultural or natural resource. It established the first national historic preservation policy for the United States.

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1912:  U.S. National Park service founded

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1912:  U.S. National Park service founded

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The Dust Bowl was the name given to the drought-stricken Southern Plains region of the United States, which suffered severe dust storms during a dry period in the 1930s.

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Ended open grazing on public "rangelands" and established the Division of Grazing in the Department of Interior to regulate entry and practices on around 80 million acres of previously unreserved federal lands.

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Lethal smog that covered the city of London for five days, caused by a combination of industrial pollution and high-pressure weather conditions. This combination of smoke and fog brought the city to a near standstill and resulted in thousands of deaths.

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1962:  Silent Spring published by Rachel Carson

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1962:  Silent Spring published by Rachel Carson

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1969:  Cuyahoga River in Cleveland, Ohio, caught fire

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1969:  Cuyahoga River in Cleveland, Ohio, caught fire

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An oil slick caught fire on the Cuyahoga River just southeast of downtown Cleveland, Ohio. The image that the "the river caught fire" motivated change to protect the environment. However, this was in fact the thirteenth recorded time that the river had caught fire since 1868.

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The United States’ primary federal air quality law, intended to reduce and control air pollution nationwide

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1972: FIFRA (Federal Insecticide, Fungicide, and Rodenticide Control Act)

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1972: FIFRA (Federal Insecticide, Fungicide, and Rodenticide Control Act)

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Provides for federal regulation of pesticide distribution, sale, and use. All pesticides distributed or sold in the United States must now be registered.

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Passed with bipartisan support in 1973, the law allows individuals and organizations to petition to have a species listed as endangered or threatened. The law requires protection for critical habitat areas and the development and implementation of recovery plans for listed species.

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During the 1973 Arab-Israeli War, Arab members of the Organization of Petroleum Exporting Countries (OPEC) imposed an embargo against the United States in retaliation for the U.S. decision to re-supply the Israeli military and to gain leverage in the post-war peace negotiations.

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1976:  RCRA (Resource Conservation and Recovery Act

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1976:  RCRA (Resource Conservation and Recovery Act

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The Resource Conservation and Recovery Act, enacted in 1976, is the principal federal law in the United States governing the disposal of solid waste and hazardous waste.

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The CWA made it unlawful for any person to discharge any pollutant from a point source into waters of the United States, unless a permit was obtained.

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1977:  Surface Mining Control and Reclamation Act

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1977:  Surface Mining Control and Reclamation Act

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The Surface Mining Control and Reclamation Act of 1977 is the primary federal law that regulates the environmental effects of coal mining in the United States. SMCRA created two programs: one for regulating active coal mines and a second for reclaiming abandoned mine lands.

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Love Canal is a neighborhood in Niagara Falls, New York, United States, infamous as the location of a 0.28 km² landfill that became the site of an enormous environmental disaster in the 1970s.

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The Three Mile Island accident was a partial meltdown of reactor number 2 of Three Mile Island Nuclear Generating Station in Dauphin County, Pennsylvania, near Harrisburg, and subsequent radiation leak that occurred on March 28, 1979.

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1980: CERCLA (Comprehensive Environmental Response, Compensation & Liability Act AKA: Superfund)

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1980: CERCLA (Comprehensive Environmental Response, Compensation & Liability Act AKA: Superfund)

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CERCLA is informally called Superfund. It allows EPA to clean up contaminated sites. It also forces the parties responsible for the contamination to either perform cleanups or reimburse the government for EPA-led cleanup work.

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The Bhopal disaster, also referred to as the Bhopal gas tragedy, was a gas leak incident on the night of 2–3 December 1984 at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, India.

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The Chernobyl disaster was a nuclear accident that occurred on Saturday 26 April 1986, at the No. 4 reactor in the Chernobyl Nuclear Power Plant, near the city of Pripyat in the north of the Ukrainian SSR in the Soviet Union.

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The Montreal Protocol on Substances that Deplete the Ozone Layer, also known simply as the Montreal Protocol, is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion.

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The Exxon Valdez oil spill was a manmade disaster that occurred when Exxon Valdez, an oil tanker owned by the Exxon Shipping Company, spilled 11 million gallons of crude oil into Alaska's Prince William Sound on March 24, 1989.

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The Kyoto Protocol was an international treaty which extended the 1992 United Nations Framework Convention on Climate Change that commits state parties to reduce greenhouse gas emissions, based on the scientific consensus that global warming is occurring and that human-made CO₂ emissions are driving it.

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The Deepwater Horizon oil spill was an industrial disaster that began on 20 April 2010, in the Gulf of Mexico on the BP-operated Macondo Prospect, considered to be the largest marine oil spill.

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2011: Fukushima Daiichi Nuclear Disaster

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2011: Fukushima Daiichi Nuclear Disaster