A biofuel is a fuel derived from biological materials such as plants, agricultural and animal wastes, crops, or grass. Since such material can be replenished readily, biofuel is considered to be a source of renewable energy. Biofuels are used globally and biofuel industries are greatly expanding in Europe, Asia, and North and South America. They contain no sulfur and produce low carbon monoxide and toxic emissions.
Biofuels are substitutes for conventional fossil fuels, such as petroleum, propane, coal, and natural gas. These energy sources are able to reduce greenhouse gas emissions and air pollution. By 2050, biofuels could reduce our greenhouse gas emissions by 1.7 billion tons per year—equivalent to more than 80% of current transportation-related emissions.