Coal ash, a euphemism for the solid waste produced by coal-burning power plants, contains arsenic, barium, boron, beryllium, cadmium, chromium, lead, mercury, molybdenum, nickel, selenium and thallium, which have been linked to cancer, birth defects, digestive illnesses, reproductive conditions, and other health problems. About 600 U.S. power plants generate 136 million tons of it every year, which they dump in about 1,160 ponds, landfills and mine shafts.
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