20100928.9479 - Greenpeace and coalition activists march in Louisville, Ky., Sept. 28, 2010. The Environmental Protection Agency is holding hearings to gather public comment on classifying coal ash, a byproduct of burning coal, as hazardous or non-hazardous. If classified as hazardous, the coal industry will be required to take steps to protect the public from the contamination of water supplies by the mercury, arsenic, selenium and other harmful substances contained in the waste material..
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