Associated Press
U.S. President Barack Obama, fourth left, is greeted by Segolene Royal, French Minister for Ecology, Sustainable Development and Energy, left, and U.S. Secretary of State John Kerry, right, is greeted by French President Francois Hollande, as they arrive for the COP21, United Nations Climate Change Conference, in Le Bourget, outside Paris, Monday, Nov. 30, 2015. (AP Photo/Christophe Ena, Pool)

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