National Geographic News, Reporting Your World Daily

Monday, November 23, 2009

Photo: Earth Day Facts: When It Is, How It Began, What to Do


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Ira Einhorn—a leader of nonviolence, drug, and free-love movements in the 1960s—speaks at Philadelphia's first Earth Day celebration on April 22, 1970, Across the U.S. the first Earth Day drew an estimated 20 million participants.

Earth Day 2009 is expected to draw a billion participants worldwide, according to Earth Day Network.

Photograph from AP/Temple University

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