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In page Outgoing longwave radiation:
"According to Kirchhoff's law of thermal radiation, the emissivity of matter is always equal to its absorptivity, at a given wavelength.[2] At some wavelengths, greenhouse gases absorb 100% of the longwave radiation emitted by the surface.[3] So, at those wavelengths, the emissivity of the atmosphere is 1 and the atmosphere emits thermal radiation much like an ideal blackbody would. However, this applies only at wavelengths where the atmosphere fully absorbs longwave radiation.[citation needed]
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