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Q19 (IAS/2008) Environment & Ecology › Climate Change & Global Initiatives › Greenhouse gas emissions Answer Verified

Consider the following: 1. Rice fields 2. Coal mining 3. Domestic animals 4. Wetlands Which of the above are sources of methane, a major greenhouse gas?

Result
Your answer: —  Â·  Correct: D
Explanation

All four listed items are established sources of methane. Methane is produced by anaerobic decomposition in flooded rice paddies and from bacterial action in submerged soils, making rice fields a significant agricultural source; livestock (domestic ruminants) emit methane via enteric fermentation and manure decomposition [1]. Wetlands are the largest natural source of methane due to saturated, oxygen-poor soils that favor methanogenesis [2]. Fossil-fuel activities including coal mining release methane as fugitive emissions during extraction and handling, adding a substantial anthropogenic source [3]. Consequently, rice fields, coal mining, domestic animals, and wetlands each contribute to atmospheric methane and its greenhouse effect.

Sources

  1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 7: Climate Change > 2. greenhouse gases > p. 11
  2. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 17: Climate Change > 17,3.3. Methane > p. 256
  3. [3] https://en.wikipedia.org/wiki/Methane_emissions
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