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Why do landfills produce methane gas even though the waste buried there is not burned?

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1. Why do landfills produce methane gas even though the waste buried there is not burned?

Organic waste buried under layers of trash decomposes without oxygen, and this anaerobic decomposition produces methane

Landfills are deliberately injected with methane for later energy recovery

Methane forms only when landfills catch fire accidentally

Plastic waste chemically reacts with soil to release methane

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