The dirty side of coal surfaced in Kingston, Tennessee in the form of a toxic black sludge last month. Coal ash, a byproduct of coal combustion, burst out of a Tennessee Valley Authority waste site and spilled out over 300 acres, endangering water supplies and public health. David Freeman, former head of the TVA, helped build the Kingston plant. He tells host Steve Curwood why he thinks coal-burning power plants should be phased out.
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