题目内容

SomeincomingsunlightisreflectedbyEarth'satmosphereandsurface,butmostisabsorbedbythesurface,whichiswarmed.Infrared(IR)radiationisthenemittedfromthesurface.SomeIRradiationescapestospace,butsomeisabsorbedbytheatmosphere'sgreenhousegases(especiallywatervapor, CO₂,andmethane)andreradiatedinalldirections,sometospaceandsomebacktowardthesurface,whereitfurther________thesurfaceandtheloweratmosphere.

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