World Earth Day

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Environmental activist Denis Hayes took Earth Day international in 1990 by mobilizing 200 million people in 141 countries and lifting environmental issues onto the world stage.

 (Pictured) Denis Hayes poses with an Earth Day sign outside Earth Day headquarters in Palo Alto, California on April 21, 1990.

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Earth Day was officially renamed by the United Nations in 2009 as International Mother Earth Day.

 (Pictured) A protester holds a sign at an Earth Day rally on April 22, 2001 in front of the United Nations in New York City.

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People celebrate Earth Day on the campus of Indiana University-Purdue University in Indianapolis in 2010.

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Founded by the organisers of Earth Day, the Earth Day Network (EDN) works with over 22,000 partners in 192 countries to promote activism and spread awareness of environmental challenges.

 (Pictured) Students join hands as they shout slogans during their campaign to protect the forests as part of the celebration of Earth Day in Manila on April 16, 2011. The students called for the end of commercial logging and mining.

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