Discussion
Which of the following is not a greenhouse gas?
Answer: C
\(\text{SO}_{2}\) (sulphur dioxide) is not a greenhouse gas.
Sulphur dioxide is an air pollutant that causes acid rain. It forms sulphate aerosols that reflect sunlight, so its effect on climate is cooling rather than warming, and it is not listed among the greenhouse gases.
Carbon dioxide, methane and the chlorofluorocarbons all absorb the infrared radiation emitted by the Earth and trap heat in the atmosphere, which makes them greenhouse gases; CFCs also destroy ozone.
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