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Q32
(CISF/2018)
Environment & Ecology › Climate Change & Global Initiatives
Which one of the following gases is not responsible for global warming ?
Result
Your answer:
—
·
Correct:
C
Explanation
Global warming is caused by Greenhouse Gases (GHGs) that trap infrared radiation in the atmosphere. The primary GHGs include carbon dioxide (CO2), methane (CH4), water vapour, nitrous oxide (N2O), and chlorofluorocarbons (CFCs).
- Water vapour is the most abundant greenhouse gas and a major contributor to the natural greenhouse effect.
- Methane is a potent GHG with a much higher global warming potential than CO2.
- CFCs are synthetic compounds that not only deplete the ozone layer but are also extremely effective at trapping heat.
Nitrogen (N2), which constitutes about 78% of the atmosphere, is not a greenhouse gas. Because N2 is a homonuclear diatomic molecule, it does not possess a dipole moment and cannot absorb the infrared radiation emitted by the Earth, meaning it does not contribute to global warming.
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