Mayor of Paris Bertrand Delanoe (L) hugs Mexico City's Mayor Marcelo Ebrad during the World Mayors Summit on Climate Change in Mexico City, Mexico, Nov. 21, 2010. Mayors from around the world signed an agreement to address climate change at the summit and the agreement will be presented to the United Nations Framework Convention for Climate Change (UNFCCC) in Cancun, next month. [Xinhua]

Los Angeles Mayor Antonio Villaraigosa (R) and Mexico City Mayor Marcelo Ebrard display the signed agreements during the World Mayors Summit on Climate Change in Mexico City, Mexico, Nov. 21, 2010. Mayors from around the world signed an agreement to address climate change at the summit and the agreement will be presented to the United Nations Framework Convention for Climate Change (UNFCCC) in Cancun, next month. [Xinhua]