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More research needed to make good on biofuel promise, experts say
Date:10/3/2008

WEST LAFAYETTE, Ind. - While cellulosic biofuels derived from grasses, crop residues and inedible plant parts have real potential to be more efficient and environmentally friendly than grain-based biofuels like corn ethanol, more research and science-based policies are needed to reap these benefits, says an international group of experts.

In an article published Friday (Oct. 3) in the journal Science, Purdue University agricultural economist Otto Doering and a team of 22 other scientists write that there is an urgent need for more comprehensive and collaborative research. This will help next-generation fuels avoid the pitfalls of grain-based biofuels, which include increased nutrient runoff and clearing of new land to recoup lost food production, Doering said.

"It's important that we begin thinking about how to deal with the unintended consequences of cellulosic biofuels as early as possible in order to ensure that they can be produced sustainably," Doering said.

The Renewable Fuel Standard within last year's energy bill guarantees cellulosic biofuels a relatively bright future, mandating that American companies purchase 21 billion gallons of cellulosic ethanol by 2022. But many questions remain unanswered, like how to comprehensively measure the impact of biofuels. To date, measures often reflect a single dimension rather than considering the system as a whole.

"There are a broad array of concerns," Doering said. "We need to consider biofuel's likely impact on water use and availability along with water quality, especially nutrient runoff. Greenhouse gas emissions must also be considered, as well as effects on soils and the landscape."

Rising demand for corn grain ethanol has gone hand-in-hand with increased water use and, oftentimes, increased nutrient runoff, Doering said. There also is mixed evidence that corn grain ethanol reduces greenhouse gas emissions. The intensive corn cultivation encouraged b
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Contact: Douglas M. Main
dmain@purdue.edu
765-496-2050
Purdue University
Source:Eurekalert  

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