The North American International Auto Show opens this week in Detroit, following a bruising year for American car companies, which lost billions of dollars. U.S. car makers are hoping that a new commitment to green technology will help move them toward recovery.
Over the past few years the show has been transformed into a competition where the major automakers try to out-green each other. But it's easier to display a concept car than to actually deliver it at a price that consumers can afford.
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