Methane is a greenhouse gas because

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(A) . Solar radiation reaches the Earth primarily in the form of visible light and shorter-wavelength infrared radiation. These radiations pass throug

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it absorbs longer wavelengths of the electromagnetic spectrum while transmitting shorter wavelengths

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(A) . Solar radiation reaches the Earth primarily in the form of visible light and shorter-wavelength infrared radiation. These radiations pass through the atmosphere and are absorbed by the Earth's surface. The Earth then re-radiates this energy as long-wavelength infrared radiation (thermal radiation). Greenhouse gases like methane $(CH_4)$ are transparent to shorter wavelengths but are highly effective at absorbing these longer-wavelength infrared radiations. By trapping this heat,they prevent it from escaping into space,thereby causing the warming of the Earth's atmosphere.

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