If you do not want to change all the lightbulbs in your home at the same time, at least change the bulbs in those lights that you use the most. Easy change to make in a very short amount of time and the effect will be not only gentler on the planet but also gentler on your electric bill. CFL bulbs last much longer as well so no need to change them as often as the old bulbs. They will pay for themselves in no time………
