Living a green life starts with teaching children how to live more sustainably. Here's a fun idea: Show your kids a utility bill when you receive it, and then go on an energy or water diet for the month. When kids are more aware how electricity or water usage can add up to big utility bills, they'll make an effort -- especially if their efforts are rewarded. After 30 days, compare the bills. Give the kids the savings amount as a reward. What child wouldn't love that?