The absorption bands for Methane [1] are mostly overlapped by those for water vapour of which there is a nearly limitless supply. Only the shortest wavelength b

The absorption bands for Methane [1] are mostly overlapped by those for water vapour of which there is a nearly limitless supply. Only the shortest wavelength band (~2.3 µm) does not have much overlap but this is also the one with the lowest absorption. [1] https://en.wikipedia.org/wiki/Absorption_band#/media/File:Atmospheric_Transmission-en.svg https://en.wikipedia.org/wiki/Absorption_band#/media/File:At...