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July 18, 2007

A waste of energy and money

I finally got an answer to something I'd wondered for some time, how much fossil fuel is required to make ethanol. A follow up was how does that energy compare with the amount of ethanol energy produced. The answer from David Pimentel:
In terms of energy output compared with energy input for ethanol production, the study found that:

* corn requires 29 percent more fossil energy than the fuel produced
* switch grass requires 45 percent more fossil energy than the fuel produced
* wood biomass requires 57 percent more fossil energy than the fuel produced.

Note however, that Michael Graboski disputes this finding on ethanol energy production.

Posted by OneEyedMan at July 18, 2007 12:39 PM

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