From a newsletter that I received today:

TAKE A STEP: SWITCH TO COMPACT FLUORESCENT BULBS Replacing just one frequently used conventional lightbulb at your home with a compact fluorescent bulb can save you money on your utility bill and reduce the amount of carbon dioxide released into the atmosphere. If every household in the United States replaced one incandescent light bulb in their home with a compact fluorescent, it would save a total of 90 million pounds of global warming pollution over the lifetime of the bulbs. This would be equal to taking 6.3 million cars off the road. Though compact fluorescent light bulbs are more expensive than conventional light bulbs, they last 10 times longer. One bulb can lower your energy bill by $15 annually and reduce your carbon dioxide emissions by 150 lbs. Take a step and switch out a lightbulb. Barbara Boxer United States Senator