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Associated Press
A live image of former President Bill Clinton is projected as he speaks with mayors, from left to right, Won Soon Park of Seoul, Ecktar Wuerzner of Heidelberg, Babatunde Fashola of Lagos, Franklyn Tau of Johannesburg, Michael Bloomberg of New York, Eduardo Paes of Rio de Janeiro, Eduardo Macri of Buenos Aires and Eduardo Kassab of Sao Paulo, during the Rio+C40 meeting, a parallel event during 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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