Clean Fuel

For articles on specific fuels used in vehicles, see Biogas, Bioethanol, Biobutanol,  Biodiesel, and Straight vegetable oil. Biofuel (also called agrofuel) can be broadly defined as solid, liquid, or gas fuel consisting of, or derived from biomass. The definition used here is narrower: biofuel is defined as liquid or gas transportation fuel derived from biomass. Biomass can also be used directly for heating or power: this is commonly called biomass fuel: see biomass heating systems. Biofuel is considered a means of reducing greenhouse gas emissions and increasing energy security by providing an alternative to fossil fuels.
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