We drive our cars, we drive our trucks, we drive our SUVs. As we do, we drive the rise in atmospheric greenhouse gases. Up to 20 percent of all greenhouse-gas emissions in the United States-971 million metric tons annually-are attributable to personal vehicle use. A report released in June by NRDC shows that if only 10 percent of driving-age Americans were to adjust their commuting and getting-around-town habits, we could prevent millions of metric tons of these gases from entering the atmosphere every year.
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