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FILE - Participants at the COP22 climate conference pose in support of climate negotiations and Paris agreement, on the last day of the conference, in Marrakech, Morocco, Nov. 18, 2016. The U.N. climate summit is back in Africa after six years and four consecutive Europe-based conferences. Marrakech is the last African city to host the event, that aimed to implement some of the Paris goals. (AP Photo/David Keyton, File)