The goal of this procedure is to reduce the amount of electricity you use for lighting by replacing the ten most
used incandescent light bulbs with compact florescent light bulbs (CFLs). This will save energy and money and reduce your CO2 emissions, with little or no impact on your lighting. 
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Just by replacing 5 regularly used incandescent bulbs with energy-efficient CFLs, you will save 500 pounds of CO2 per year. Start with lights you use more than 3 hours per day, for the greatest CO2 savings and quickest payback.
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For every additional bulb you replace with a CFL, you will save another 100 pounds of CO2 a year. How could this get any easier!

