Plant Waste Biofuels Benefit From Food Debate

In the search for renewable energy, turning low-value materials like switchgrass and corn husks into ethanol to fuel cars is something of a Holy Grail. In theory, these materials would replace corn as the main feedstock for ethanol in North America, reducing the pressure on farmland that has played a role in rising food prices and put drivers into competition with hungry people. But scientists on the front lines of this search are finding that making the process commercially and environmentally viable is proving much harder than some of the hype would suggest.