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Biomethane is a naturally occurring gas.
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It is produced by anaerobic digestion of organic matter such as dead animal and plant material, manure, sewage, organic waste, etc.
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Biomethanation is the process by which organic material is microbiologically converted to biogas, under anaerobic conditions.
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This gas is produced out of natural degradation process and escapes into the atmosphere unused.
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If it is trapped and used in automobile engines, it reduces the net impact on environment and at the same time produces useful power.