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1740s



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Greenhouse gases

... from 700 ppvb to 1721 ppvb Nitrous oxide 15%, from 275 to 311 ppvb CFC-12 from 0 to 0.503 ppvb HCFC-22 from 0 to 0.105 ppvb Perfluoromethane[?] from 0 to 0.070 ...