21st Session Of Conference On Climate Change COP21 Opens At Le Bourget

PARIS, FRANCE - NOVEMBER 30: (L-R) King Abdallah II of Jordan and Carl Gustaf of Sweden and U.S President Barak Obama attend the Family photo session of the Cop 21 on November 30, 2015 in Paris, France. World leaders are meeting in Paris for the start of COP21, the two-week UN climate change summit, attempting to agree on an international deal to curb greenhouse gas emissions. (Photo by Pascal Le Segretain/Getty Images)