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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev107

Which statements about the greenhouse effect are correct?

AGreenhouse gases absorb the infrared emitted by the Earth's surface.
BPart of the absorbed energy is re-emitted back towards the surface.
CWithout the natural greenhouse effect the average surface temperature would be much lower.
DThe effect is caused mainly by $CO X_{2}$ absorbing the incoming visible sunlight.

Answer: A, B, C

Short-wave sunlight passes mostly unabsorbed. The Earth emits long-wave infrared, which greenhouse gases absorb and partially re-emit downward, keeping the surface warmer than otherwise. So the fourth statement is wrong.

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