Q. Which of the following is/are possible causes for methane emissions which amount to global warming?
1. Extensive rice cultivation
2. Raising of livestock
3. Wetlands
Select the correct answer using the codes given below:

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: D
Notes:

Explanation:

  • Methane is emitted by natural sources such as wetlands, as well as human activities such as leakage from natural gas systems, the raising of livestock, and extensive rice agriculture.
  • Natural processes in soil and chemical reactions in the atmosphere help remove methane from the atmosphere.
  • Irrigated rice fields are the major source of methane from rice fields.
  • Methane from rice contributes around 1.5 percent of total global greenhouse gas emissions
  • Livestock generates methane in two main ways: through their digestion and through their waste.
  • Methane (CH4) is a hydrocarbon that is a primary component of natural gas.

Source: ForumIAS