This `Popcorn' Can Stop Acid Rain Before It Starts

To keep coal-fired power plants from belching chemicals that cause acid rain, emissions are bubbled through vats of limestone sludge before they even reach the smokestack. Although effective in removing sulfur dioxide, the vats don't catch nitrogen oxide, another acid-rain villain. And the method requires costly equipment that is frequently clogged by sludge and corroded by acid by-products.

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