More Galleries
Meet the new Microsoft Xbox
Meet the new Microsoft Xbox
Microsoft is making a bid to own the living room with its new entertainment device. More
5 worst Internet acquisitions of all time
5 worst Internet acquisitions of all time
As well as the 5 best. More
8 ways to hit the road in an RV
8 ways to hit the road in an RV
Retiring boomers are helping the recreational vehicle industry get back on track. Here are 8 choices for traveling in style. More
4 of 5
BACK NEXT
Cellulosic ethanol
Cellulosic ethanol

Pluses: Made by breaking down wood chips, farm waste, and nonfood crops like grasses, cellulosic ethanol wouldn't require diverting the use of cropland. Scientists are making progress at breaking down plants' tough cellulose and lignin molecules, the key to turning nonfood biomass into fuel.

Minuses: Still costly and difficult to make, ethanol produced from nonfood plants is more energy intensive than that made from corn and sugar cane. By one estimate, putting all the grassland in the U.S. into fuel production could replace only about 10% of petroleum.

NEXT: Algal biofuel
Last updated April 22 2008: 7:09 AM ET
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: © 2013 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 © 2013 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. 2013. All rights reserved. Most stock quote data provided by BATS.
© 2013 Cable News Network. A Time Warner Company. All Rights Reserved. Terms under which this service is provided to you. Privacy Policy. Ad choices .