"You definitely want to keep the environment healthy, because we're living in it and we want to keep it for as long as we can," says Ashley Tisdale (High School Musical 2). So how does she do her part? "I don't use that much hairspray."

What little things can you do to help the environment? Find out in our iGo Green section. Plus: Pair hot stars like Cameron Diaz and Leonardo DiCaprio to their green cause in Celebrity Matchmaker: Green & Famous.