Earth Day was founded in the very end of the 1960's
The idea started developing in September 1969...
(1)
...and in April 1970, the first Earth Day gathered millions of American protesters !
Click on the satellite image of our planet
to find out about Earth Day in wikipedia.
Global warming is one of Earth Day concerns
In this video Al Gore, rougly explains
the global warming process :
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(1) = A N.A.S.A. image of the Earth (Public Domain)
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