BioFuel

category of Alternative Energy

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

"First-generation fuels" refer to biofuels made from sugar, starch, vegetable oil, or animal fats using conventional technology. (includes Ethanol)

Second-gen: non-food sources, including Cellu Lose.

related: BioMass http://en.wikipedia.org/wiki/Biomass#Biomass_conversion_process_to_useful_energy

• burning is bad! http://www.energyjustice.net/biomass
• BioChar https://en.wikipedia.org/wiki/Biochar