Planet in Peril: Battle Lines Thursday, December 11 at 9 p.m. ET on CNN

Watch "Planet in Peril: Battle Lines" in HDTV on Thursday, December 11, at 9 p.m. ET on CNN, hosted by Anderson Cooper, chief medical correspondent Dr. Sanjay Gupta and "The Oprah Winfrey Show" correspondent and National Geographic host Lisa Ling.

CNN's award-winning series examines the environmental conflicts between growing populations and natural resources including the threat of global warming to both humans and wildlife.

Learn more about the Planet in Peril documentary.

Global warming is one of the most serious threats facing our global community today. But YOU can make a difference. Just take some simple actions in your home - such as switching to compact fluorescent light bulbs, adjusting your thermostat, running the dishwasher only when full, recycling - and you'll become part of the solution to reduce global warming!

Small actions can make a big impact... Take the Pledge and become an official Good Neighbor today.