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Energy Savers: When to Turn Lights and Computers Off to Save Energy and Money : "Coal fired power plants produce about 50 percent of the electricity in the United States. Natural gas fired power plants provide about 15 percent, nuclear plants about 18 percent, hydro dams about 10 percent, and the rest is from oil (about 3 percent) and 'renewable' sources such as biomass, geothermal, wind, and solar power plants. Fossil fuel combustion power plants (coal, gas, and oil) emit carbon dioxide, sulfur dioxide (mainly from coal and oil fired power plants), nitrous oxides, and particulates and heavy metals such as mercury (coal fired power plants). Regardless of the source of electricity, if you consume less, you are reducing the impact you have on the environment."