Earth Day is an annual day on which events are held worldwide to increase awareness and appreciation of the Earth's natural environment. Earth Day is now coordinated globally by the Earth Day Network, and is celebrated in more than 175 countries every year. In 2009, the United Nations designated April 22 International Mother Earth Day. Earth Day is planned for April 22 in all years at least through 2015.
The name and concept of Earth Day was allegedly pioneered by John McConnell in 1969 at a UNESCO Conference in San Francisco. He proposed March 21, 1970, the first day of spring in the northern hemisphere. This day of nature's equipoise was later sanctioned in a Proclamation signed by Secretary General U Thant at the United Nations. About the same time a separate Earth Day was founded by United States Senator Gaylord Nelson as an environmental teach-in first held on April 22, 1970. While this April 22 Earth Day was focused on the United States, an organization launched by Denis Hayes, who was the original national coordinator in 1970, took it international in 1990 and organized events in 141 nations. Numerous communities celebrate Earth Week, an entire week of activities focused on environmental issues.
世界地球日即每年的4月22日，是一項世界性的環境保護活動。最早的地球日活動是1970年代於美國校園興起的環保運動，1990年代這項活動從美國走向世界，成為全世界環保主義者的節日和環境保護宣傳日，在這天不同國籍的人們以各自不同的方式宣傳和實踐環境保護的觀念。
wiki : http://en.wikipedia.org/wiki/Earth_Day
中文 : http://zh.wikipedia.org/wiki/%E4%B8%96%E7%95%8C%E5%9C%B0%E7%90%83%E6%97%A5
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