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Which best explains how greenhouse gases heat the earth?

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But some gases in the atmosphere—most importantly carbon dioxide, or CO2, but also methane, nitrous oxide, and water vapor—will not let all the infrared radiation pass through. These “greenhouse gases” are very good at absorbing infrared light. They spread the heat back to the land and the oceans. read more

Greenhouse gases (any gas with 3 or more atoms) will trap the sun's infrared radiation (heat) being radiated by the Earth's surface, and prevent it from escaping back into space. This heat from the warmed up gases is also re-radiated in all directions, including back down to the earth's surface, which warms some more. read more

Greenhouse gases absorb heat rising from the surface of the earth. These warmed gases radiate heat in all directions, including back onto the earth, heating the atmosphere. So the heat is not lost to space, but instead builds up in the atmosphere where it heats the earth as well. read more

Greenhouse gases absorb heat rising from the surface of the earth.These warmed gases radiate heat in all directions, including backonto the earth, heating the atmosphere. read more

Greenhouse gases effect the atmosphere by creating a 'blanket' over the earth, allowing heat, in the form of infra-red radiation, to pass into the earth but not out again, thus heating up the earth, and thus causing global warming. read more

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