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Hoping consumers will make greener choices while shopping for new cars, two states require disclosure of how much global-warming gas the vehicles emit. Connecticut just joined California in insisting that window stickers display the numbers. Jim Motavalli of E-The Environmental Magazine says most Americans have a difficult time connecting auto exhaust and climate change. He's hoping that fuel economy concerns will spur consumers to greener choices. California has laws that will result in a 22 pe