Here's the impact:

If every household in the U.S. replaced a burned-out bulb with an energy-efficient, ENERGY STAR qualified compact fluorescent bulb, the cumulative effect is enormous. It would prevent greenhouse gas emissions equivalent to that from nearly 800,000 cars. It would also save enough energy to light 2.5 million homes for a year!

There are now highly efficient compact fluorescent light bulbs (CFLs) that last for years, use a third of the energy of regular bulbs and actually produce more light. Look for the government's ENERGY STAR label, which means the bulb has been tested for quality and efficiency.

While each ENERGY STAR qualified bulb can cost more initially - anywhere from $4 to $15 a piece - remember that there are two price tags: what you pay at the register and what you pay in energy costs over the bulb's lifetime. You may pay more up front, but you will actually save hundreds of dollars in your household budget over the long term because of their long life. Five ENERGY STAR light bulbs will save your household at least $150 over their lifetime!!