New York mayor Michael R. Bloomberg, right, and Babatunde Fashola of Lagos, shake hands 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)

Associated Press
New York mayor Michael R. Bloomberg, right, and Babatunde Fashola of Lagos, shake hands 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)
New York mayor Michael R. Bloomberg, right, and Babatunde Fashola of Lagos, shake hands 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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