There are plenty of celebrities advocating for a greener, better world. Vegetarian activist Stella McCartney is makes strides in the fashion industry with eco fabrics, while Alicia Silverstone is spreading the word with her book The Kind Diet. Salma Hayek drives a hybrid car and chairs an annual green auction to raise funds for the environment. Adrian Grenier, meanwhile, uses his star status to promote causes like his new SHFT.com web series.
Is there a star who's on your eco radar? Tell us who in the comments.