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  • Air pollutants have dropped 67 percent

    According to the EPA’s website between 1980 and 2012, gross ­domestic product increased 133 percent, vehicle miles traveled increased 92 percent, energy consumption increased 27 percent and U.S. ­population grew by 38 percent. During the same time period, total ­emissions of the six principal air pollutants dropped by 67 percent.

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