After a first season hailed as "the most important television series ever," the Emmy® award-winning documentary series, Years of Living Dangerously, returns with a second season to the National Geographic Channel, for an even deeper look at some of the most urgent climate change problems threatening the planet, and at some very real solutions. From India and China, to Africa and the United States, Years tells important and compelling human stories about individuals, communities and governments facing critical choices that will impact the lives of millions for generations to come. This season's team of celebrity correspondents includes David Letterman in is first post-Late Show assignment, Arnold Schwarzenegger, Sigourney Weaver, Gisele Bündchen Jack Black, Ty Burell, Cecily Strong, Ian Somerhalder, America Ferrara, Nikki Reed and Aasif Mandi.