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There is no backradiation because energy won't move from the cooler atmosphere to the warmer surface of the earth. IR is absorbed, emitted, and then it is off to cooler climes because energy won't flow from cool to warm. I have heard some warmers try to explain trapping by claiming that the radiation goes from CO2 moleucle to CO2 molecule thus retaining it in the atmosphere longer and causing warming. That doesn't fly any more than backradiation because the IR is emitted from the CO2 molecule at a very slightly longer wavelength than at which it was absorbed which renders it invisible to other CO2 molecules.