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1854 — Henry David Thoreau publishes Walden
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1866 — The term ecology is coined in German as Oekologie by Ernst Heinrich Philipp August Haeckel
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1872 — The term acid rain is coined by Robert Angus Smith in the book Air and Rain
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1905 — The term smog is coined by Henry Antoine Des Voeux in a London meeting to express concern over air pollution
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Woodrow wilson was elected president. -
1916 — US Congress created the National Park Service
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Warren G. Harding is elected president -
Calvin Coolidge is elected president -
Herbert Hoover is elected president -
Franklin D. Roosevelt is elected president -
Harry S. Truman is elected president -
Dwight D. Eisenhower was elected president -
John F. Kennedy was elected president -
1962 — Rachel Carson publishes Silent Spring
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Lyndon B. Johnson became president after kennedy was assassinated. -
1968 — The Apollo 8 picture of Earthrise
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Richard M. Nixon was elected president -
1970 — Earth Day – April 22., millions of people gather in the United States for the first Earth Day organized by Gaylord Nelson, former senator of Wisconsin, and Denis Hayes, Harvard graduate student. US Environmental Protection Agency established
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1769 — Philadelphia committee led by Benjamin Franklin attempts to regulate waste disposal and water pollution.
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1989 — Montreal Protocol on substances that deplete the ozone layer entered into force
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1997 — The Kyoto Protocol was negotiated in Kyoto, Japan in December. Countries that ratify this protocol commit to reduce their emissions of carbon dioxide and five other greenhouse gasses
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2001 — U.S. rejects the Kyoto Protocol
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2017 — U.S. announces it will cease participation in the Paris Agreement on climate change mitigation
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2021 — U.S. announces it will rejoin the Paris Agreement on climate change mitigation