Hong Kong's Secretary for the Environment Edward Yau, left, speaks as former Colombia's President Andres Pastrana, second left, Sydney's Mayor Clover Moore, Sao Paulo's Mayor Gilberto Kassab, and ... more 
Hong Kong's Secretary for the Environment Edward Yau, left, speaks as former Colombia's President Andres Pastrana, second left, Sydney's Mayor Clover Moore, Sao Paulo's Mayor Gilberto Kassab, and Heidelberg's Mayor Eckart Wurzner, right, listen during the C40 Large Cities Climate Summit in Sao Paulo, Brazil, Thursday, June 2, 2011. less 
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Associated Press | Photo By Andre Penner
Thu, Jun 2, 2011 1:30 PM EDT