A program in Columbia, S.C., again will offer discounts on electric lawn mowers in exchange for gas-powered models in a bid to reduce air pollution. One riding mower running for an hour can produce emissions equal to 34 cars, said Myra Reece from the state's Department of Health and Environmental Control. The mower exchange has helped recycle more than 1,300 gas mowers since 2007, which is similar to removing 230 cars from state highways, Reece said.

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