7 of 13
BACKNEXT
Using more biofuels
Congress recently required refiners to replace 36 billion gallons of gasoline with biofuels by the year 2022. Currently the nation uses about 140 billion gallons of gas a year, with ethanol comprising about 9 billion gallons of that. Half of the 36 billion gallons are required to come from non-food crops like switch grass. Many want to see even higher rates of biofuels use.

They say displacing oil with domestically grown plants will offset over a million barrels of oil a day, and that's just under the current law. They also say biofuels emit far fewer greenhouse gasses than oil when the plant-growing process is taken into account.

But critics say biofuels are partly responsible for the surge in food prices, groundwater depletion and pollution, and pressure on topsoil. They also say it's perverse to put food in gas tanks when people are starving.

NEXT: Tapping the Strategic Petroleum Reserve

Last updated September 25 2008: 3:43 PM ET
More Galleries
50 years of the Ford Mustang Take a drive down memory lane with our favorite photos of the car through the years. More
Cool cars from the New York Auto Show These are some of the most interesting new models and concept vehicles from the Big Apple's car show. More
8 CEOs who took a pay cut in 2013 Median CEO pay inched up 9% in 2013 to $13.9 million. But not everyone got a bump last year. Here are eight CEOs who missed out. More

Special Offer
Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.