From Live Science: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.
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