Ages ago, I wrote a post about cellulosic ethanol, that is, ethanol derived from grass. That post was also written in opposition to corn-based ethanol, which has a much lower energy yield per acre.
Scientists have discovered that corn-based ethanol requires three times as much water as previously thought to be produced. So not only is corn-based ethanol inefficient at producing energy, it's also a water hog. Did I mention that native prairie grasses (which are used in cellulosic ethanol production) require little or no irrigation?
Hmm...
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