Encyclopedia article covers classes of fuel, energy content, problems and solutions, international efforts and additional resources.

Unlike other renewable energy sources, biomass can be converted directly into liquid fuels, called "biofuels," to help meet transportation fuel needs. ...

Feb 8, 2008 ... Almost all biofuels used today cause more greenhouse gas emissions than ... So crops from old plantations go to Europe for biofuels, ...

Jul 10, 2007 ... Biofuel champions assure us that because fuel crops are renewable, ... But when the full lifecycle of biofuels is considered, ...

Biofuels such as ethanol made from corn, sugar cane, switchgrass and other crops are being touted as a "green" solution for a large part of America's ...

The biofuels life-cycle: At each stage of the life-cycle, energy ... New Studies Portray Unbalanced Perspective on Biofuels: DOE Committed to ...

May 23, 2008 ... A report from clean-tech analysis firm New Energy Finance quantifies the relative impact that booming biofuels production has on food.

Jan 7, 2008 ... Biofuels reduce greenhouse-gas emissions in comparison to fossil fuels. In the journal Science, researchers consider environmental costs of ...

Two new studies show that biofuels aren't the solution to global warming — and may even exacerbate the problem.

The push for ethanol and other biofuels has spawned an industry that depends on billions of dollars of taxpayer subsidies, and not only in the United States ...