If you can prove it, and you're so sure Pimentel is wrong, put your crop in the ground without the use of any fossil fuels, then harvest it and make the juice and see what you've got left. I could almost guarntee you that if you close the loop on that system, it will not be sustainable... which IS the goal if anyone is to suggest that ethanol is a 'renewable' energy. That will sort the truth from the ponzi schemes.
Pimentel is quite correct to allow for the energy used to mine the ore, make the iron and build the tractor. It's all energy that is used that would not otherwise be used if you wern't producing ethanol. He may be wrong or overzelaous in some of his assumptions with regard to what energy is consumed, but other studies I've looked at are equally if not more dismissive in the other direction. I beleive that there is likely a rather narrow net energy loss with ethanol... but even if there was a narrow net energy gain, one would have to wonder if the resources it consumes are worthwhile for such a small gain.
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