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Among the following, the one that is not a greenhouse gas is:

1. nitrous oxide
2. methane
3. ozone
4. sulphur dioxide

Correct answer: sulphur dioxide

Solution

Sulphur dioxide (SO2) is not considered a greenhouse gas because it does not significantly trap heat in the Earth's atmosphere like nitrous oxide, methane, and ozone do. Instead, SO2 can lead to cooling by forming aerosols that reflect sunlight.

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