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Associated Press
New York Mayor and C40 Chair Michael Bloomberg speaks during the Rio+C40: Megacity Mayors Taking Action on Climate Change, a parallel event taking place alongside the UN Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Tuesday, June  19, 2012. While squabbling between rich and poor countries threatens to derail the Earth summit, the world’s mayors say they can’t afford the luxury of endless, fruitless negotiations and are already taking real action to stave off environmental  disaster and preserve natural resources for future generations. (AP Photo/Felipe Dana)

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