Discussion
Carbon dioxide and other 'greenhouse gases' act by
Answer: B
Greenhouse gases act by trapping heat in the earth's atmosphere.
Sunlight, mostly visible and near-infrared, passes through the atmosphere and warms the surface, which re-radiates the energy as longer-wavelength infrared. Carbon dioxide, methane, water vapour and nitrous oxide absorb that infrared and re-emit much of it back towards the surface, so the lower atmosphere stays warmer than it otherwise would.
Ozone destruction is caused by chlorofluorocarbons and is a different problem. Greenhouse gases do not let in more visible light, and they do not reduce the energy reaching the surface; they slow its escape.
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