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10,000 years ago:  Agricultural revolution 

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10,000 years ago:  Agricultural revolution 

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Walden is a collection of essays written by Thoreau as he tried to live simply and isolated in a cabin. It is the beginnings of the transcendentalism movement and some of the first displays of environmental conciousness.

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This act gave citizens 160 acres of land in the central and western United States as long as they lived on and improved it. It is some of the first legislation aimed at developing the new western territories gained.

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1872:  Yellowstone National Park founded

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1872:  Yellowstone National Park founded

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

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

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Gifford Pinchot was the first head of the U. S. forest service and the fourth chief of the U. S. division of forestry. His efforts led to the founding of the U. S. forest service that manages national forests and grasslands.

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He is the author of A Sand County Almanac and was a prominent naturalist, scientist, ecologist, conversationalist, and environmentalist.

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This act was the first U. S. law to provide protection for locations deemed natural and cultural resources. It can be seen as the beginnings of the creation of National Parks.

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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 Southern Plains region of the United States that was struck by droughts in the 1930s were often called the "dust bowl" for their frequent and severe dust storms.

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This act was signed into effect by FDR to end open grazing on public lands. It created the Division of Grazing in the Department of Interior to regulate nearly 80 million acres of federal lands.

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The Great Smog of 1952 was a condition of heavy pollution in London. A rise in air pollutants due to an increase in coal consumption combined with low wind conditions led to a thick smog covering across the city of London.

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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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The level of pollution of the Cuyahoga River was so great that the contaminants actually caught fire and burned up to five stories tall.

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This act allowed the federal and state governments to place regulations on mobile sources of emissions like cars and stationary sources of emissions like factories.

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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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This act was passed to regulate the use of different types of pesticides in the U. S. after their harmful health effects were discovered.

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Encouraged the conservation of ecosystems that were deemed essential for the survival of threatened and endangered species of wildlife.

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The OPEC enacted an embargo on the U. S. and other allies for their assistance of Israel during current conflicts. This embargo placed a strain on the U. S. economy and launched a string of U. S. efforts to become less dependent on foreign oil.

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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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This act give the Environmental Protection Agency authority to regulate the generation, transportation, treatment, storage, and disposal of hazardous waste.

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This act made it unlawful for anyone to dump pollutants into the waters of the U. S.

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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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This act serves as the primary law for regulation of the environmental effects of coal mining in the U. S.

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After a failed economic endeavor, Love Canal became a chemical dumping ground. Later, the land was sold to and developed by the city into a working class community, until the chemical tanks burst and began leaking poisonous chemicals into the soil underneath the community.

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The three mile nuclear incident was the biggest commercial nuclear power plant meltdown in U. S. history. Thankfully, no health effects were recorded with plant workers or the public.

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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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Commonly referred to as the federal Superfund, the CERCLA created a fund to be used to clean up uncontrolled or abandoned hazardous-waste sites as well as accidents or emergency releases like oil spills.

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On the night of December 2-3, an industrial gas leak occured at a pesticide plant in Bhopal, India. Over 2,259 individuals died as a result of the leak.

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The No. 4 reactor of a nuclear power plant near Pripyat in present day Ukraine experienced a nuclear chain reaction. All citizens within a 30 km radius of the plant eventually had to be evacuated due to the spread of nuclear contaminants.

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This is a global agreement, signed in 1987, to reduce or eliminate the production and use of products that harm the ozone layer of the atmosphere. It was the first treaty to receive universal ratification around the globe.

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This man made disaster occurred when the Exxon Valdez oil tanker spilled millions of gallons of crude oil into the waters of Alaska's Prince William Sound. This spill killed hundreds of thousands of local wildlife and was at the time the larges oil spill in U. S. history.

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The Kyoto Protocol created the UNFCCC to hold countries to commitments to reduce greenhouse gas emissions in order to reach certain set targets. It was initially created in 1997 and ratified in 2005.

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This disaster is the largest oil spill in human history. It began after an explosion on the Deepwater Horizon oil rig and over 4.9 million barrels of oil were estimated to have spilled into the Gulf of Mexico.

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2011: Fukushima Daiichi Nuclear Disaster

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2011: Fukushima Daiichi Nuclear Disaster