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Opening Night Of "The Book Of Mormon" At The Pantages Theatre - Red Carpet

HOLLYWOOD, CA - SEPTEMBER 12: Ed Begley Jr. attends 'The Book Of Mormon' Los Angeles Opening Night at the Pantages Theatre on September 12, 2012 in Hollywood, California. (Photo by Araya Diaz/Getty Images for Pantages Theatre)

Earth Day: Stars and Their Environmental Causes

We're celebrating Earth Day by taking a look at stars who are taking an active role in protecting our planet with their charitable work.