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I do have one question tho. If the CO2 concentration saturates the IR absorption, dosent any addition afterward have no increased effect?
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No, because although there is a narrow peak where all infrared radiation of a certain wavelength is absorbed, CO2 also absorbs infrared radiation of other wavelengths. So, as mentioned in the summary, a each doubling of CO2 concentrations will increase temperatures by the same amount, all other things being equal.