Biodiesel is a domestically produced, renewable fuel that can be manufactured from vegetable oils,
animal fats, or recycled restaurant greases. Biodiesel is safe, biodegradable, and reduces serious air
pollutants such as particulates, carbon monoxide, hydrocarbons, and air toxics.
Ethanol is an alcohol-based alternative fuel produced by fermenting and distilling starch crops that
have been converted into simple sugars. Feedstocks for this fuel include corn, barley, and wheat. Ethanol
can also be produced from "cellulosic biomass" such as trees and grasses and is called bioethanol. Ethanol
is most commonly used to increase octane and improve the emissions quality of gasoline.