Description : What are the main sources of methane gas ?
Last Answer : 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.