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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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What happens when 900 million metric tons of coal get burned?

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Roughly 100 million metric tons of coal ash is created, a residue laced with nasty elements like arsenic, lead and mercury.

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We perform this transformation every year in the U.S.

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Storing all that ash is a challenge.

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That's why roughly 4 billion liters of the toxic stuff mixed with water was left to sit in a massive pond near Kingston, Tennessee.

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Five years ago on December 22, that pond burst its walls, drowning more than a square kilometer of land and killing portions of the Emory and Clinch rivers.

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The Tennessee Valley Authority has been cleaning up the so-called Christmas coal ash flood ever since.

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But such catastrophic events are not the only way coal ash gets into our waterways.

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Rainwater can percolate through the ash when it's improperly stored.

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A new report from a non-profit advocacy organization called the Environmental Integrity Project shows that the groundwater near TVA coal-fired power plants is contaminated with a toxic stew of elements.

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The issue extends well past TVA jurisdiction.

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More than 580 coal ash sites exist across the U.S.

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We should work to get all that ash safely disposed of before another five Christmases pass.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello,

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