Lower energy bills
We save a bunch of money on our utility bill by using compact flourescent bulbs in all of our light fixtures and lamps. We also keep computers, TVs and other devices that draw power even when off, on power strips which we switch off when not using the device. The passive use of power really adds up.
We bought a very energy-efficient washer and refrigerator. Our electric bill is now small. Once, during the height of the Enron scam, it went over $400 for just one month!
Yes, CF bulbs cost more, but they last longer, aren't as fragile, and pay for themselves within 500 hours of use. And better costs more, anyway.
You too save yourself a bunch of money and not think about the fact that you're helping fight Global Warming.