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Eco-celebs: Tree-huggers at heart

Off the red carpet, these Hollywood hotties are going to bat for the planet. See which environmental causes celebrities like Brad Pitt and Daryl Hannah have aligned themselves with.
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Eco-celebs

Beneath the glitz and glamour, these Hollywood hotties -- including Bradley Cooper, who wore a tuxedo made from recycled materials to the 2013 Golden Globes -- are tree-huggers at heart.