When supermodel Cindy Crawford starts contributing to Vanity Fair's environmental blog, you know either hell has frozen over, or the eco-movement has reached its zenith of chic. The "green is hip (and profitable)" trend is sure to fade, but the movement of "modeling with a conscience," will continue to thrive. Meet seven pioneering, idealistic women who truly care about the planet and are using their celebrity and keen fashion sense to make a difference. (Text: Leah Koenig)