A car that gets 20 miles per gallon will emit about 50 tons of carbon dioxide over its lifetime. A car getting 40 mpg will emit half that much. When buying your next car, pick the least-polluting, most efficient vehicle that meets your needs. Maybe it's an innovative hybrid that combines a gasoline engine with electric motors (and never needs to be plugged in). Or maybe it's a wagon instead of an SUV. And over the average lifetime of an American car, a 40-mpg car will save roughly $3,000 in fuel costs compared with a 20-mpg car, so compare fuel economy performance before you buy. (See www.fueleconomy.gov's Find and Compare Cars feature.)
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