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Celebrities always seem to be plugging one cause or another, and critics often question if they really know anything or care about the causes they're flogging.

Grist, the irreverent online journal of environmental news and commentary ("doom and gloom with a sense of humor") has put together its own ranking of "green actors" who aren't just acting concerned about the environment.

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Topping the list of 15 is Leonardo DiCaprio, recently of "Blood Diamond" and "The Departed," who's got his own environmental foundation and is working on a documentary about global warming (Move over, Al Gore).  Others making Grist's honor roll include Robert Redford, Cameron Diaz, George Clooney, Cate Blanchett and Columbia native Edward Norton, of last year's "The Painted Veil" and "The Illusionist."

Those on the list aren't just talking green. They usually drive hybrid or electric vehicles and live in solar homes. Oddly, nowhere on the list, even among runners-up, are Ted Danson and Woody Harrelson, two celebrities who've been touting environmental causes for years.

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