An earlier version of 4 Green Stars story included an incorrect sales number for Toyota's Prius. The number has been corrected.
DETROIT (TheStreet) -- Green cars took center stage at the press preview of the Detroit Auto Show this week.
General Motors (GM) had already rolled out the Volt with a massive publicity effort that included a national tour. At the show, GM CEO Dan Akerson told reporters: "The Volt will help us change how people think about Chevrolet."
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