Part 1 of the two-part Planet in Peril airs tonight (Oct. 23) on CNN. I have not seen it, so here is some info they have provided:

Planet in Peril uses first-hand investigative reporting to provide a better understanding of the environment’s present state. Bringing viewers the stories behind the statistics, CNN anchor Anderson Cooper, chief medical correspondent Dr. Sanjay Gupta and Animal Planet host and wildlife biologist Jeff Corwin will focus on four main issues that threaten the planet and its inhabitants: climate change, deforestation, species loss and overpopulation. Planet in Peril, filmed across four continents and 13 countries, airs over two nights on CNN/U.S. on Tuesday, Oct. 23, and Wednesday, Oct. 24, from 9 p.m. to 11 p.m. (ET/PT) and globally on CNN International.