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The gas evolved during the anaerobic decomposition of vegetation can cause which of the following?

1. Ozone hole
2. Acid rain
3. Corrosion of metals
4. Global warming and cancer

Correct answer: Global warming and cancer

Solution

Anaerobic degradation of vegetation produces methane (marsh gas), a strong greenhouse gas contributing to global warming; the intended option here is 'global warming and cancer'.

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