Paper 1 · People, Development and Environment
UGC NET December 2021 June 2022 (11.07.2022) Shift-I
Global warming is attributed to the presence of which of the following gases in the atmosphere?
- 1. Methane
- 2. Sulphur dioxide
- 3. Surface ozone
- 4. Nitrogen dioxide
- 5. Carbon dioxide
A1, 2, 3 and 5 only
B1, 3 and 5 only ✓ Correct
C1, 3, 4 and 5 only
D1, 2, 4 and 5 only
Correct answer: (B) 1, 3 and 5 only — The greenhouse gases named here are methane, surface ozone, and carbon dioxide, so the answer is 1, 3 and 5.
Explanation
★The greenhouse gases named here are methane, surface ozone, and carbon dioxide, so the answer is 1, 3 and 5.
★Greenhouse gases trap outgoing infrared radiation and warm the lower atmosphere.
★Carbon dioxide from fossil fuel burning is the largest contributor to warming.
★Methane from agriculture, livestock, and waste is a potent greenhouse gas.
★Surface or tropospheric ozone acts as a greenhouse gas near the ground.
★Sulphur dioxide actually forms aerosols that tend to cool rather than warm the climate.
★Nitrogen dioxide is chiefly an air pollutant, while nitrous oxide is the strong greenhouse form of nitrogen.
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