In “Planet in Peril,” CNN anchor Anderson Cooper, CNN’s chief medical correspondent, Dr. Sanjay Gupta, and Animal Planet host and wildlife biologist Jeff Corwin take viewers around the globe for a two-part documentary on the threats to the world’s environment. “Planet in Peril” was filmed in 13 countries, uncovering places where environmental change is not a theory or a future forecast but a crisis happening in real time. Bringing viewers the stories behind the statistics, Cooper, Corwin and Gupta focus on today’s environmental threats and their impact on tomorrow.