Celebrities Who Contribute to the Environment

The latest issue of Vanity Fair profiles tons of celebrities who contribute to the environment.

Leonardo DiCaprio is featured on the cover for his  new documentary film "The 11th Hour" along with Knut, a polar bear from the Berlin Zoo.

They were photographed separately by Annie Leibovitz (DiCaprio in Iceland and Knut in Berlin) then morphed together for the cover. Dicaprio is trying to save polar bears from becoming extinct due to global warming.

Here are some of the other celebrities that contribute to the environment:

• Jackson Browne
• Perry Farrell
• Jack Johnson
• Chuck Leavell
• Julia Louis-Dreyfus
• Keb' Mo'
• Alanis Morissette
• Bonnie Raitt
• Robert Redford
• Dave Stewart