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Philadelphia committee led by Benjamin Franklin attempts to regulate waste disposal and water pollution.
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Henry David Thoreau published Walden
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The term ecology is coined in German as Oekologie by Ernst Heinrich Philipp August Haeckel
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The term acid rain is coined by Robert Angus Smith in the book Air and Rain
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The term smog is coined by Henry Antoine Des Voeux in a London meeting to express concern over air pollution
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US Congress created the National Park Service
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First artificial Earth satellite, U.S.S.R.
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First animal launched into space, U.S.S.R.
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First spacecraft to hard-land on another celestial object; The Moon , U.S.S.R.
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First pictures of the far side of the Moon, U.S.S.R.
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First human to orbit Earth, U.S.S.R.
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Rachel Carson published Silent Spring
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First data returned from another planet, U.S.
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First woman in space, U.S.S.R.
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First space walk, U.S.S.R.
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First spacecraft pictures of Mars, U.S.
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First death during a space mission, U.S.S.R.
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The Apollo 8 picture of Earthrise
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First Earth Day (April 22) Millions of people gather in the United States for the first Earth Day. US Environmental Protection Agency established.
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Montreal Protocol on substances that deplete the ozone layer entered into force.
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The Kyoto Protocol was negotiated in Kyoto, Japan in December. Countries that ratify this protocol commit to reduce their emissions of carbon dioxide.
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U.S. announces it will cease participation in the Paris Agreement on climate change mitigation.
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U.S. announces it will rejoin the Paris Agreement on climate change mitigation.