Exclusive Clip: Leo's 'The 11th Hour'

"Growing Pains" star Leonardo DiCaprio wants to save the planet, and to help the cause he brings you "The 11th Hour," an environmental-friendly, feature-length documentary on "how to change the course." The film, co-starring Stephen Hawking, Mikhail Gorbachev, and sustainable design expert William McDonough, will begin offsetting your carbon usage when it opens August 17. Watch an exclusive clip below.