Today, make it your goal to lower one bill. Maybe it's your electricity bill: make it a goal to see the number on that bill lower next month. You can mak a big difference on your electricity bill just by being an aware consumer. Turn lights off when you leave the room, and don't allow for phantom energy usage - many appliances use energy just by being plugged in. You can cut back by hooking all your office equipment, for instance, to a power bar. Especially when you go travelling, shut that entire power bar down.
Take any bill, and lower it.