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US President Barack Obama (L) sits with Chinese President Xi Jinxing during a bilateral meeting ahead of the opening of the UN conference on climate change COP21 on November 30, 2015 at Le Bourget, on the outskirts of the French capital Paris. More than 150 world leaders are meeting under heightened security, for the 21st Session of the Conference of the Parties to the United Nations Framework Convention on Climate Change (COP21/CMP11), also known as Paris 2015 from November 30 to December 11. AFP PHOTO / JIM WATSON / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

US President Barack Obama (L) sits with Chinese President Xi Jinxing during a bilateral meeting ahead of the opening of the UN conference on climate change COP21 on November 30, 2015 at Le Bourget, on the outskirts of the French capital Paris. More than 150 world leaders are meeting under heightened security, for the 21st Session of the Conference of the Parties to the United Nations Framework Convention on Climate Change (COP21/CMP11), also known as Paris 2015 from November 30 to December 11. AFP PHOTO / JIM WATSON / AFP / JIM WATSON        (Photo credit should read JIM WATSON/AFP/Getty Images)