The Ethanol Scam

The most seductive myth about ethanol is that it will free us from our dependence on foreign oil. But even if ethanol producers manage to hit the mandate of 36 billion gallons of ethanol by 2022, that will replace a paltry 1.5 million barrels of oil per day — only seven percent of current oil needs. Even if the entire U.S. corn crop were used to make ethanol, the fuel would replace only twelve percent of current gasoline use.

Another misconception is that ethanol is green. In fact, corn production depends on huge amounts of fossil fuel — not just the diesel needed to plow fields and transport crops, but also the vast quantities of natural gas used to produce fertilizers. Runoff from industrial-scale cornfields also silts up the Mississippi River and creates a vast dead zone in the Gulf of Mexico every summer. What's more, when corn ethanol is burned in vehicles, it is as dirty as conventional gasoline and does little to solve global warming: E85 reduces carbon dioxide emissions by a modest fifteen percent at best, while fueling the destruction of tropical forests.

But the biggest problem with ethanol is that it steals vast swaths of land that might be better used for growing food. In a recent article in Foreign Affairs titled "How Biofuels Could Starve the Poor," University of Minnesota economists C. Ford Runge and Benjamin Senauer point out that filling the gas tank of an SUV with pure ethanol requires more than 450 pounds of corn — roughly enough calories to feed one person for a year.

Thanks in large part to the ethanol craze, the price of beef, poultry and pork in the United States rose more than three percent during the first five months of this year. In some parts of the country, hog farmers now find it cheaper to fatten their animals on trail mix, french fries and chocolate bars. And since America provides two-thirds of all global corn exports, the impact is being felt around the world. In Mexico, tortilla prices have jumped sixty percent, leading to food riots. In Europe, butter prices have spiked forty percent, and pork prices in China are up twenty percent. By 2025, according to Runge and Senauer, rising food prices caused by the demand for ethanol and other biofuels could cause as many as 600 million more people to go hungry worldwide.

Despite the serious drawbacks of ethanol, some technological visionaries believe that the fuel can be done right. "Corn ethanol is just a platform, the first step in a much larger transition we are undergoing from a hydrocarbon-based economy to a carbohydrate-based economy," says Vinod Khosla, a pioneering venture capitalist in Silicon Valley. Next-generation corn- ethanol plants, he argues, will be much more efficient and environmentally friendly. He points to a company called E3 BioFuels that just opened an ethanol plant in Mead, Nebraska. The facility runs largely on biogas made from cow manure, and feeds leftover grain back to the cows, making it a "closed-loop system" — one that requires very few fossil fuels to create ethanol.

Khosla is even higher on the prospects for cellulosic ethanol, a biofuel that can be made from almost any plant matter, including wood waste and perennial grasses like miscanthus and switchgrass. Like other high-tech ethanol evangelists, Khosla imagines a future in which such so-called "energy crops" are fed into giant refineries that use genetically engineered enzymes to break down the cellulose in plants and create fuel for a fraction of the cost of today's gasoline. Among other virtues, cellulosic ethanol would not cut into the global food supply (nobody eats miscanthus or switchgrass), and it could significantly cut global-warming pollution. Even more important, it could provide a gateway to a much larger biotech revolution, including synthetic microbes that could one day be engineered to gobble up carbon dioxide or other pollutants.