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Q88 (IAS/2010) Environment & Ecology › Climate Change & Global Initiatives › Greenhouse gas emissions Answer Verified

Consider the following which can be found in the ambient atmosphere: 1. Soot 2. Sulphur hexafluoride 3. Water vapour Which of the above contribute to the warming up of the atmosphere?

Result
Your answer: —  Â·  Correct: D
Explanation

All three listed constituents contribute to atmospheric warming. Soot (black carbon) is a light‑absorbing particulate (not a gas) that directly warms the atmosphere and can accelerate melting when deposited on snow and ice [1]. Sulphur hexafluoride (SF6) is an anthropogenic, very potent and long‑lived greenhouse gas with a high global warming potential, so its presence contributes to radiative forcing despite low concentrations [2]. Water vapour is the largest single contributor to the natural greenhouse effect and acts as a strong, fast feedback (its atmospheric abundance increases with temperature, amplifying warming from other gases) [3]. Thus 1, 2 and 3 all contribute to atmospheric warming, via different mechanisms and timescales.

Sources

  1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 17: Climate Change > 17.3.6. Black Carbon > p. 258
  2. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 29: Environment Issues and Health Effects > Greenhouse gases (GHGS) > p. 426
  3. [3] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 17: Climate Change > r7.3.r. Water vapour > p. 255
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