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The waste from power plants is essentially what is left over when you burn coal. And as we all know, coal is a relatively dirty mineral.

"Toxic Waters: Regulatory Absence Allows Chemical, Coal and Farm Industries to Pollute US Water Supplies". "Democracy Now!" with Amy Goodman and Juan Gonzalez, www.democracynow.org. October 22, 2009.
The waste from power plants is essentially what is left over when you burn coal. And as we all know, coal is a relatively dirty mineral.