Biofuels
People have been burning wood and peat for heat and light for hundreds of thousands of years. In recent millenia, wood and charcoal have been used for potmaking and the extraction and working of metals.
I guess you could call the tallow used for candles and the animal muscles used for transport and other tasks could also be called biofuels.
Biomass such as wood is renewable, but we need to take care to renew it and not let demand outstrip supply.
Modern examples of biofuels include the biogas digestion of agricultural wastes, woodchips derived from short rotation coppices used as fuel for combined cycle gas turbines.
Under construction
Articles
Green biodiesel production starts BBC April 04 2005
Coal Goes Cofiring, Mercury Air Emissions Reduced up to 90% Green Energy Resources April 04 2005
Biomass energy market red hot Portland Press-Herald, Maine April 03 2005
In Renewable Energy Portfolios, Biomass is #1, US Govt Confirms Green Energy Resources March 28 2005
Philadelphia to Bring "Green" Energy to the World Green Energy Resources March 22 2005
Energy, Coal, and "Clean Air" in Five Years Green Energy Resources March 15 2005
UK 'lagging on biomass potential' BBC May 11 2004
Ministers back biodiesel plant BBC March 25 2004
'Green' diesel fuels the forest BBC October 21 2003
Best fuel source baa none? BBC June 27 2003 (NZ)
Cooking oil 'to be turned into fuel' BBC December 01 2002
Links
AFB-net (Agriculture and Forestry Biomass Network) (part of EUBIONET)
Argent Energy
Bioenergy Information Network (Oak Ridge National Laboratory, TN, US)
British Biogen (Trade Association)
Logpile (NEF)
Petroplus