see more

PARIS, FRANCE - NOVEMBER 30: (L-R) British Prime Minster David Cameron, Prince Charles, Prince of Wales, Prince Albert II of Monaco and German Chancellor Angela Merkel attend the family photo session of the COP 21 on November 30, 2015 in Le Bourget, 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)

PARIS, FRANCE - NOVEMBER 30:  (L-R) British Prime Minster David Cameron, Prince Charles, Prince of Wales, Prince Albert II of Monaco and German Chancellor Angela Merkel attend the family photo session of the COP 21 on November 30, 2015 in Le Bourget, 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)