Earth Day was first celebrated on April 22, 1970. Founded by former US Senator Gaylord Nelson as an environmental teach-in, Earth Day is now coordinated by Earth Day Network, with extensive programming and events around the world. In 2009, the United Nations also declared April 22 to be International Mother Earth Day, an observance that "recognizes a collective responsibility, as called for in the 1992 Rio Declaration, to promote harmony with nature and the Earth to achieve a just balance among the economic, social and environmental needs of present and future generations of humanity." Look magazine first published the ecology flag shown above on April 21, 1970.
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