PARIS, FRANCE - DECEMBER 06: Top (2L-R) United States of America Ambassador to France Jane Hartley, The Governor of California, Jerry Brown, bottom (CL-CR) Governor of Mato Grosso in Brazil, Pedro Taques and Aldo Berlinguer, Italian Department for Environment, Territory, Infrastructure and Transport during the signing of the memorandum on subnational global climate leadership on December 6, 2015 in Paris, France. The signing was part of the conference on climate change COP21 which was held at the residence of the United States of America Ambassador to France Jane Hartley. (Photo by Aurelien Meunier/Getty Images)
