Meet the True Green Hollywood Celebrities

By Marc Lallanilla, About.com Guide

Anyone who's willing to sit in a tree protesting for 23 days in support of urban farming -- and then get arrested for it -- has earned their place on the green carpet. Daryl Hannah joined activists in the 2006 protest in South L.A., but she's been living a sustainable lifestyle for many years: The actress drives a car powered by biodiesel fuel, and maintains a blog dedicated to environmental and social principles.