Biofuel
Biofuel is any gas or liquid fuel that derives either from recently living organisms or their metabolic byproducts, such as manure from cows. It is a renewable energy, unlike nuclearfossil sources (petroleum, coal and nuclear energy).There are three main classes:
- Bioalcohols: ethanol and methanol, when they are not produced from produced petroleum:
- Significant amount of ethanol produced from sugar beets is being used as automotive fuel in Brazil and from maize, (or corn) is being used as a gasoline additive (oxygenator) in the United States.
- Currently, methanol is produced from natural gas. It is possible, but not economically viable at anywhere near current price levels, to produce methanol from biomass (biomethanol).
- Lipid biofuels:
- Gas