Offer advice to a friend who could use a hand switching from the dark side to the green side. Changing a lifetime of bad habits isn't easy, so be patient with your pals as they attempt to alter their lifestyles for the better. Show them how to save money (and energy) by turning off the faucet while brushing their teeth and by taking shorter showers. Help them organize a carpool to get to work, and tell them the best places for organic shopping.