What are the main sources of methane gas ?

What are the main sources of methane gas ?
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The main sources of methane gas are: 1. Domestic animal waste , II. Digestion of animals and aquatic plants , 3. Grain cultivation wetlands , 4. Termites , 5. Combustion of biofuels , 6. Landslides , 6. Waste of natural gas , 6. Coal extraction , 9. Natural gas field.
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