French President Francois Hollande (R) and US President Barack Obama (L) attend the "Mission Innovation: Accelerating the Clean Energy Revolution" meeting on the opening day of the World Climate Change Conference 2015 (COP21) at Le Bourget, near Paris, on November 30, 2015. 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 / POOL / IAN LANGSDON / AFP / POOL / IAN LANGSDON        (Photo credit should read IAN LANGSDON/AFP via Getty Images)