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French President Francois Hollande (C) poses on December 10, 2015 at the Elysee palace in Paris with French environmental activist Nicolas Hulot (C-L) religious community representatives involved in environmental issues who came to deliver international petitions urging political leaders at the COP21 climate summit to take decisive action to curb global warming. (Photo by Michel Euler / POOL / AFP) (Photo credit should read MICHEL EULER/AFP/Getty Images)

French President Francois Hollande (C) poses on December 10, 2015 at the Elysee palace in Paris  with French environmental activist Nicolas Hulot (C-L) religious community representatives involved in environmental issues who came to deliver international petitions urging political leaders at the COP21 climate summit to take decisive action to curb global warming. (Photo by Michel Euler / POOL / AFP)        (Photo credit should read MICHEL EULER/AFP/Getty Images)