21st Session Of Conference On Climate Change COP21 : Day 5 In Paris

PARIS, FRANCE - DECEMBER 04: Former Mayor of New York City, Michael Bloomberg and Mayor of Paris, Anne Hidalgo pose with thousand mayors from different cities at the Paris city hall during the Summit of Local elected for Climate at the Paris city hall on December 04, 2015 in Paris, France. Thousand mayors from different cities gather at the Paris city hall during the COP21, Paris Climate Conference. (Photo by Chesnot/Getty Images)