Celebrities offer easy tips for going green in book

It's not just trendy to be environmental, it's easy. So says a new book that features everyday tips for greener living, plus advice from celebs — from Jennifer Aniston to Owen Wilson — who've already gone green.

"Sometimes it can be a bit daunting and seem like you're in algebra class trying to figure out some of the stuff involved with helping the environment," said Wilson, one of a dozen celebrities who contributed personal essays to "The Green Book." "These are very easy-to-understand ideas that everyone could apply, just little, small steps people can take to make a positive contribution."

Wilson, 38, said that when he bought a Prius a few years ago it acted as a "gateway drug" that inspired him to become more environmental.