"Auto manufacturers are betting that higher gas prices and more environmentally friendly technology will convince more Americans to buy diesel vehicles, which currently make up 40 percent of auto sales in Europe."
"Most auto manufacturers stopped selling diesels in the United States in the 1990s. But diesels are back, as Mercedes-Benz, Jeep and Volkswagen roll out vehicles at the 2004 New York International Automobile Show."
"Environmentalists are split on diesel vehicles. While they are more fuel-efficient and produce less CO2 emissions than gasoline cars, they emit more particulate matter and NOxs."
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The Diesel Comeback
Wired, Diesels Rolling Back Into U.S.: