= Solution
Absorption depends on an allowed transition with a nonzero <transition dipole moment> and appreciable line strength at <wavelengths> carrying terrestrial <thermal radiation>. <Molecular vibration> and <molecular rotation>, level populations and <pressure>/temperature-dependent line shapes determine the spectrum. A band in an <atmospheric window> can be more effective incrementally than one already strongly absorbed by <water> or <carbon dioxide>. Symmetry can make a vibration <infrared> inactive even when the <molecule> has many <normal modes>. <Atmospheric lifetime> affects the persistence of a released gas, \b[not the intrinsic absorption strength of one <molecule>].
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