"I recycle, says Frances O'Connor (Cashmere Mafia). "We got rid of our car. It's very much in the consciousness now. In London, where I live, there are a lot of hybrids now."

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