Biomass - The waste matter of animals and plants, CNG - Compressed natural gas , Fossil fuel - Fuels which are formed from decomposition of living things over a period of millions of years, Fuel - A substance that produces energy on burning, Green fuel - Fuel which causes less environmental pollution, LPG - Liquefied petroleum gas, Non renewable source of energy - A source of energy likely to be available only for a limited period of time, Petroleum - Fossil fuel used mainly for transportation, Renewable source of energy - Sustainable source of energy likely to be always available,

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