An existing cap-and-trade program that aimed to reduce power-plant emissions has been successful in bringing down pollution levels, according to data released by the Environmental Protection Agency. The program is different from the current greenhouse-gas reduction bill pending in Congress. "Since its inception in 1995 as part of the Clean Air Act Amendments of 1990, EPA's Acid Rain Program has earned widespread acclaim" as a result of significant reductions in sulfur dioxide and nitrogen oxide emissions, the agency said in a statement.

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