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Francois Hollande, France's president, pauses during the action day at the United Nations COP21 climate summit, at Le Bourget, in Paris, France, on Saturday, Dec. 5, 2015. Frances energy and environment minister Segolene Royal yesterday said the fate of the United Nations global warming talks hinges on the willingness of richer countries to pay poorer ones more for climate-related projects. Photographer: Christophe Morin/Bloomberg via Getty Images

Francois Hollande, France's president, pauses during the action day at the United Nations COP21 climate summit, at Le Bourget, in Paris, France, on Saturday, Dec. 5, 2015. Frances energy and environment minister Segolene Royal yesterday said the fate of the United Nations global warming talks hinges on the willingness of richer countries to pay poorer ones more for climate-related projects. Photographer: Christophe Morin/Bloomberg via Getty Images