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People view a pro-environment house model during a promotion of the Earth Day in San Francisco, the United States, April 23, 2011. Earth Day was founded by United States Senator Gaylord Nelson as an environmental teach-in first held on April 22, 1970. Earth Day is now coordinated globally by the Earth Day Network and is celebrated in more than 175 countries every year. [Xinhua]
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![People view a pro-environment house model during a promotion of the Earth Day in San Francisco, the United States, April 23, 2011. Earth Day was founded by United States Senator Gaylord Nelson as an environmental teach-in first held on April 22, 1970. Earth Day is now coordinated globally by the Earth Day Network and is celebrated in more than 175 countries every year. [Xinhua]](http://images.china.cn/attachement/jpg/site1007/20110425/0014222d98500f1f21d916.jpg "People view a pro-environment house model during a promotion of the Earth Day in San Francisco, the United States, April 23, 2011. Earth Day was founded by United States Senator Gaylord Nelson as an environmental teach-in first held on April 22, 1970. Earth Day is now coordinated globally by the Earth Day Network and is celebrated in more than 175 countries every year. [Xinhua]")
