Latest concept car trend: Small and green. Concept cars are looking like reality shows on wheels. They have to after last week's Supreme Court ruling, which will force automakers to build models that emit less pollution. But can economy cars be hip or is that akin to McDonald's frying a healthy Big Mac? General Motors will find out by showing three minicar concepts at this week's New York International Auto Show. Consumers can select their favorite — Beat, Trax or Groove — at www.vote4chevrolet.com — and GM says it will build it.
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