Biofuels, such as biodiesel produced from oil-seeds, and ethanol produced from wood or sugarcane, can be a greenhouse-neutral, renewable energy source for use in transport vehicles, stationary engines, and small electricity generators.
In some cases, however, the amount of fuel consumed in the production and distribution, etc, of a quantity of biofuel can exceed that quantity. If the fuel consumed is fossil fuel, and the biofuel production is subsidised, then the biofuel subsidy is in effect a fossil fuel subsidy.
Biofuels - facts and fiction. Mark Anslow. Ecologist. 2007.2.19
Biofuels. Natural Resources, Forests and Agriculture. Australian Greenhouse Office
The Hidden Costs of Biofuels. Judy Skatssoon. ABC. 2005.9.27
Meeting the Climate Challenge. International Climate Change Taskforce. 1995