Multiple choice

Hydropower plants release methane gas by

  1. destroying large ecosystems

  2. destroying fossil fuels

  3. submerging natural vegetation which rots under anaerobic conditions

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vegetation that gets submerged and rots under anaerobic conditions produces a large amount of methane gas. Hence, option (3) is correct.

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