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Luís, one question. You in the end measure production output considering ethanol, but the last (1/0.75) factor seems to be derived from an EROI or 4:1 (from bio-diesel), instead of 2:1 (ethanol)
Shouldn't therefore the total crop area be roughly the double, i.e. equal to the combined surface areas of Germany & Poland?

Notice that the comparative advantage of bio-diesel to ethanol in EROEI is more than cancelled by its comparatively lower production density. That ensures that ethanol figures are a lower bound on agricultural surface demand.

by findmeaDoorIntoSummer on Sat Apr 5th, 2008 at 11:57:37 AM EST
Predictions of crop production per hectare (or acre) are based on previous history and with GW coming down they are certainly wrong.  Second, the high yields of corn (maize) in the US are dependent on petro-chemical inputs; the highest yielding GM crops are utterly dependent on large, even massive, doses of pesticides, fertilizers, & etc., all stemming from crude oil.

Thus, I wouldn't take the EROEI figures floating around too seriously.

A doo run-run-run, a doo run-run

by ATinNM on Sat Apr 5th, 2008 at 12:32:27 PM EST
[ Parent ]
GW is George Walker or Global Warming?, and what are the differences?
by findmeaDoorIntoSummer on Sat Apr 5th, 2008 at 03:12:56 PM EST
[ Parent ]
Global Warming.  

George Walker is a noxious pest infestation.  The overt signs of this parasite will be over by the end of 2008.  Unfortunately, the damage it caused has weakened the fields and enabled other pests, parasites, and disease-causing organisms to flourish.  It is estimated it will take anywhere from four to twenty years to get rid of these secondary invaders.

There are two minds regarding the proper eradication effort.  One group is strongly in favor of the Obama™ method which involves widespread reconstruction of grassroots to choke-out the remaining pests.  The Hillary™ method involves a Top/Down dressing on the fields to stunt pest growth.  Unfortunately, both of these requires a costly Spinal Implant procedure to members of the Congress of the United States.

Another school advocates the McCain™ patented Invisible Hand© treatment.  This involves letting the parasites run amok until the whole thing falls over.  

The assumption is either the Obama™ or Hillary™ will be selected in November but one shouldn't count the last out.


A doo run-run-run, a doo run-run

by ATinNM on Sun Apr 6th, 2008 at 04:45:22 PM EST
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