Paper 1 · People, Development and Environment
UGC NET June 2023 (22.06.2023) Shift-I
Which of the following greenhouse gases has no natural source?
ACarbon dioxide
BMethane
CNitrous oxide
DHalocarbons ✓ Correct
Correct answer: (D) Halocarbons — Halocarbons have no natural source, so the answer is halocarbons.
Explanation
★Halocarbons have no natural source, so the answer is halocarbons.
★Carbon dioxide, methane and nitrous oxide all arise from natural processes as well as human activity.
★Halocarbons are made by combining a halogen with a hydrocarbon.
★They are produced industrially, for example for refrigerants and solvents.
★They do not occur naturally in the environment.
★So among these greenhouse gases only halocarbons have no natural source.
★Therefore the answer is halocarbons.
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