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We recently heard that, according to one group of researchers at Environmental Science & Technology magazine, corn ethanol has a water cost of 50 gallons per mile. Now, a team working from the University of Twente in the Netherlands has calculated the water cost of ethanol and other biofuels and to make bioelectricity. The results are not pretty. The researchers looked at 13 crops and tried to calculate the most efficient way to turn them into energy depending on where the crops were grown,

The nail in the coffin of corn-based ethanol might be made of water. The magazine Environmental Science & Technology has published an article that pegs the amount of water needed to make enough corn ethanol to move a vehicle one mile at 50 gallons. That's pretty high.