How do greenhouse gases keep the Earth warm?

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Question

How do greenhouse gases keep the Earth warm?

Accepted Answer

They absorb and re-emit some of the long-wavelength radiation leaving the Earth — Greenhouse gases absorb outgoing long-wavelength (infrared) radiation and re-radiate some of it back towards Earth, keeping it warm.

Answer

They absorb and re-emit some of the long-wavelength radiation leaving the Earth

Answer

They produce heat directly

Answer

They reflect sunlight away

Answer

They cool the surface

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