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By acoin
via phys.org
Published: Feb 01 2013 / 11:48

Despite advances in alternative energy sources, the United States will continue to rely on coal-fired power plants to generate much of the nation's electricity for the next 20 years or more. While coal is an economically viable fuel, its environmental cost is high—in 2011, coal accounted for 34 percent of the energy-related carbon dioxide (CO2) emissions in the United States.
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