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Rich Americans produce nearly 25% more heat-trapping gases than poorer people at home, according to a comprehensive study of U.S. residential carbon footprints. California by far is the greenest state with 2,715 pounds of greenhouse gas per person. The studys 25 cleanest zip codes for residential greenhouse gas emissions are all in California and New York. Because some zip codes didnt have adequate data, Goldstein said there may be additional zip codes at the extremes of the emissions spectrum. Also, he said some zip codes with smaller, expensive, energy-efficient apartments buck the national trend of greater emissions in wealthy areas.