What exactly is ethanol?
The fuel is derived from plants through a fairly straightforward process. In one common method Corn, is first ground into a fine powder, mixed with water, and then heated. An enzyme is then added to convert the mixture into sugars before yeast is added to ferment it. The resulting liquid, called "beer," is about 10% alcohol. A distillation process then separates the alcohol from the rest of the mixture before the remaining water is removed. The result is essentially pure alcohol. A small amount of gas is added to render the liquid undrinkable. Then the fuel can be used by itself or as a supplement to gasoline to power cars.
Ethanol has three advantages, at least in theory: It's renewable, it can be domestically produced, and it burns cleaner than gas. The world's largest producers of ethanol are the U.S., which makes it primarily from corn, and Brazil, which mashes the stuff out of sugarcane.
Beyond high gas prices, why is everyone talking about ethanol?
It's becoming an increasingly important part of the fuel supply, and has the potential to become still more crucial. President George W. Bush and members of Congress have expressed support for ethanol use. And this spring, refiners in parts of Texas and the Northeast have been replacing a gasoline additive called MTBE (for methyl tertiary-butyl ether) with ethanol. MTBE, a chemical used to oxygenate fuel, can contaminate drinking water. And Ethanol which does not present the same danger, can serve the same purpose in fuel.
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