Fuel that is derived from biomass, matter from plants (like corn) or animal waste, is called biofuel. Biomass is renewable and is typically combusted. The carbon dioxide which is released when biofuels are burned does not add to the net carbon dioxide in the atmosphere, since the released carbon dioxide would have recently been extracted from the air by the source of the biofuel.
The use of biofuels is increasing rapidly, and scientists and engineers worldwide are continuously improving them. Biofuels have bright future in helping to reduce our dependence on fossil fuels. The two most common biofuels are biodiesel and ethanol.