As temperatures continue to rise, a group of Hollywood stars wants to focus on climate change with a new documentary. "Years of Living Dangerously," a nine-part documentary beginning Sunday on CBS Corp's premium cable network Showtime, charts the impact on the global climate and the consequences for humanity. Director James Cameron appealed to well-known Hollywood actors to act as correspondents, including Harrison Ford, Matt Damon, Don Cheadle, Jessica Alba and Michael C. Hall.