Which of the following is NOT a greenhouse gas?
a) Carbon dioxide
b) Water vapor
c) Methane
d) Nitrous oxide
e) Nitrogen.
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The correct answer is (e) Nitrogen.
Nitrogen is not considered a greenhouse gas. The primary greenhouse gases are carbon dioxide, water vapor, methane, and nitrous oxide, all of which trap heat in the Earth’s atmosphere and contribute to global warming. Nitrogen, while making up about 78% of the Earth’s atmosphere, does not have the same heat-trapping properties.