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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 photograph of Earth taken from the orbit
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First orbital solar observatory
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Rachel Carson published Silent Spring
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First piloted orbit around the moon.
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The Apollo 8 picture of Earthrise
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First human on the moon.
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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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First photograph of Venus from Space
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First photograph of the entire solar system.
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Montreal Protocol on substances that deplete the ozone layer entered into force
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First landing on an asteroid.
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First sample return from a comet.
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First space telescope designated to search for Earth-like exoplanets
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First orbit of Mercury