The description “biofuel” is a generic one used to describe liquid or gas fuels that are not derived from petroleum based fossils fuels or contain a proportion of non fossil fuel. Biofuels fall into two main categories- conventional biofuels produced from plants, crops such as sugar beet, rape seed oil or re-processed vegetable oils - and advanced biofuels from gasified biomass. At present, most biofuels fall into the conventional category.

Petroleum refining glossary. 2013.

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