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Associated Press
A man pedals his bike past cars stopped in traffic at Copacabana in Rio de Janeiro, Brazil, Thursday, May 10, 2012. The upcoming Rio + 20 conference, billed as a "historic opportunity" to build a greener future, appears to be going up in smoke. President Barack Obama won’t be there, and the leaders of Britain and Germany have bowed out. Entire delegations have canceled. The conference is the follow-up to the U.N.'s 1992 Earth Summit, also held in Rio, which helped put climate change on the world agenda. (AP Photo/Felipe Dana)

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