http://home.clara.net/darvill/altenerg/biomass.htm

http://en.wikipedia.org/wiki/Biofuel

http://journeytoforever.org/biodiesel.html

http://www.eia.doe.gov/kids/energyfacts/sources/renewable/biomass.html

http://www1.eere.energy.gov/biomass/

http://news.mongabay.com/2006/0806-660.html

http://www.treepower.org/cofiring/pictures.html