Automakers are using this month's Consumer Electronics Show and North American International Auto Show to unveil their latest green car concepts. At the 2008 North American International Auto Show in Detroit, GM is expected to introduce the Chevrolet Volt, a zero-carbon emitting electric compact car with a range of about 30 miles, and Ford will reveal its EcoBoost engine, which the company says can provide a 20 percent improvement in fuel economy with reduced emissions. GM has already unveiled a Cadillac hydrogen/battery-powered concept at the Consumer Electronics Show in Las Vegas. The Cadillac Provoq would utilize GM's E-Flex propulsion system, which combines the company's fifth-generation fuel cell with a lithium-ion battery, producing no carbon emissions.


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