Just think, replacing just one 100-watt lighbulb with a 23-watt compact fluorescent lightbulb will save, over the life of the bulb, the equivalent of 500 pounds of coal, and reduce emissions by over 1300 pounds of CO2. And the reduced energy costs easily pay for the cost of the bulb in no time at all. And that's just one bulb! Just think if every household replaced 5 or even 10 bulbs...