New US Study: Making biofuel could threaten water supplies and the oceans

Saturday, 11 April 2009 10:32

The production of bioethanol may use up to three times as much water as previously thought, a new study finds, becoming the latest work that could burst the biofuel bubble.

A gallon of ethanol may require up to more than 2,100 gallons of water from farm to fuel pump, depending on the regional irrigation practice in growing corn, according to the study detailed in the April 15 issue of journal Environmental Science & Technology.

But the water usage isn't quite so high everywhere: A dozen states in the Corn Belt consume less than 100 gallons of water per gallon of ethanol, making them better suited for ethanol production, the study found.

"The results highlight the need to take regional specifics into account when implementing biofuel mandates," the authors wrote.

Bioethanol, typically made from plant sources such as corn or switch grass, is often touted as a clean-burning alternative to gasoline or other fossil fuels, which give off significant amounts of carbon dioxide and other pollutants.

Other studies have questioned the benefits of biofuels, noting that they may require more energy in production than they provide; they may not reduce greenhouse gas emissions as much as hoped; and the fertilizers required to grow the crops to make the fuel may exacerbate oceanic dead zones as a result of chemical runoff into streams.

Article Continues: http://www.msnbc.msn.com/id/30158655/

Bookmark

Email this

Comments (0)