Paper 1 · People, Development and Environment
The largest natural source of methane, which emits the gas from microorganisms that decompose organic materials in the absence of oxygen, is
AWetland ✓ Correct
BEnteric digestion
CFuel gases
DPermafrost
Correct answer: (A) Wetland — The largest natural source of methane is wetland, so that is the answer.
Explanation
★The largest natural source of methane is wetland, so that is the answer.
★In wetlands, microorganisms break down organic matter without oxygen.
★This anaerobic decomposition releases methane.
★Wetlands do this on a huge scale, so they are the largest natural source.
★Enteric digestion, fuel gases and permafrost release less by comparison.
★So the answer is wetland.
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