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Most utility companies now offer a "green power" option, where you pay a little extra, and for the amount of power you use, they purchase green power on the open market. The power they buy comes from solar and wind projects all over the country.

The cost is usually not much more than the regular power they sell. If you can't afford to pay the extra for all your power, many companies give you the option of buying half or a quarter of your power as green.

This is an easy and affordable way to use renewable energy at your house, without installing solar panels or wind generators on your property.

The CO2 savings are tremendous and easily calculated by determining the amount of power being offset, based on average power use per household and what portion the user is getting as green power. If you want to be more accurate, the user should input the state they live in, and the calculation could account for the energy sources in that state (different sources have different CO2/kwh ratios).