21st Session Of Conference On Climate Change COP21 Opens At Le Bourget [Getty Images]

PARIS, FRANCE - NOVEMBER 30: French President Francois Hollande (L) welcomes King Carl Gustaf of Sweden (R) as he arrives for the COP21 United Nations Climate Change Conference on November 30, 2015 in Le Bourget, France. More than 150 world leaders are meeting for the 21st Session of the Conference of the Parties to the United Nations Framework Convention on Climate Change (COP21/CMP11), from November 30 to December 11, 2015 (Photo by Chesnot/Getty Images)

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