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"Coal made up about 40% of the U.S. electric supply in the first half of the year. It is the single largest source of power. The new Environmental Protection Agency (EPA) rules, if enacted, will"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.aol.com/article/2013/10/05/one-question-the-epa-rules-dont-answer/20738393/?gen=1>