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The researchers estimate that the nation could face damages worth 0.7 percent of gross domestic product per year by the 2080s for every 1 degree Fahrenheit rise in global temperature. But that overall number obscures wide variations: The worst-hit counties – mainly in states that already have warm climates, like Arizona or Texas – could see losses worth 10 to 20 percent of G.D.P. or more if emissions continue to rise unchecked.
