The toxic red sludge that engulfed the streets of a Hungarian town this week appears almost alien, but toxic waste is a very real threat for millions people in the United States.
Coal ash, a byproduct of coal power plants, is stored in largely unregulated dumps across the country, and retaining walls holding in the toxic material occasionally give way.
A large coal ash spill near Kingston, Tenn. destroyed homes and scarred the environment in a 300-acre area in December 2008.
The coal ash...
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