Atmospheric CO2: Climate’s ‘control knob’

Discovery News: If water vapor and clouds account for roughly 75 percent of the greenhouse effect in the atmosphere, then why all of the fuss about carbon dioxide? New experiments by researchers at NASA's Goddard Institute for Space Studies in New York produce a dramatic answer to this question. Andrew Lacis and colleagues added and subtracted each of the greenhouse gases from the atmosphere of their best climate model -- the water vapor and clouds that condense, evaporate and precipitate from the ......

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