Distinguish between the followings.
Biogas and natural gas
Biogas is obtained from the decomposition of farm wastes, animal and human wastes by the activity of anaerobic bacteria. They are available in limited quantities and are mostly used in rural areas. It can be used as a clean-burning fuel. Decomposition of organic matter results in the formation of biogas, which has higher thermal efficiency in comparison to kerosene, dung cake, and charcoal. It gives no smoke and thus, quite useful as a fuel.
Whereas the natural gas is obtained in a natural form directly from nature due to the action if many microbes on the dead matter over long periods of time. The gas is available in large quantities and can be used as a source of power. It serves as a raw material in petrochemical industries. It is supplied for household use as LPG (Liquefied petroleum Gas) and also used for running vehicles as CNG (Compressed Natural Gas).