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French President Francois Hollande (C), President of the French National Assembly, Claude Bartolone (5thL), French Foreign Minister Jean-Marc Ayrault (7thL), French Environment Minister Segolene Royal (8thL), French Minister for Overseas Territories, George Pau-Langevin (3rdR), Paris mayor Anne Hidalgo (R), President of the French Constitutional Council, Laurent Fabius (Behind Bartolone), who acted as President of the COP21 last December, and other officals leave after posing for a group photo at the Elysee palace on June 15, 2016 in Paris, after a ceremony for the ratification of the COP21 agreement reached in Paris aimed at keeping a rise in global temperatures below 1.5 degrees Celsius. / AFP / ALAIN JOCARD (Photo credit should read ALAIN JOCARD/AFP via Getty Images)

French President Francois Hollande (C), President of the French National Assembly, Claude Bartolone (5thL), French Foreign Minister Jean-Marc Ayrault (7thL), French Environment Minister Segolene Royal (8thL), French Minister for Overseas Territories, George Pau-Langevin (3rdR), Paris mayor Anne Hidalgo (R), President of the French Constitutional Council, Laurent Fabius (Behind Bartolone), who acted as President of the COP21 last December, and other officals leave after posing for a group photo at the Elysee palace on June 15, 2016 in Paris, after a ceremony for the ratification of the COP21 agreement reached in Paris aimed at keeping a rise in global temperatures below 1.5 degrees Celsius. / AFP / ALAIN JOCARD        (Photo credit should read ALAIN JOCARD/AFP via Getty Images)