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It does lose just a little.  The vibration caused by the absorption of IR takes some small bit of energy so the IR is emitted at a very slightly longer wavelength that at which it was absorbed.  That slight difference is why its emission is invisible to other CO2 molecules.  Backscattering or backradiation is a fantasy, a fiction, a fabrication by people who want desperately for the laws of physics to mean something other than that which they do.


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