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1. What about the allegations that it takes more energy to produce a
gallon of ethanol that that gallon puts out when burned as fuel? Is that
no longer the case?
2. I realize that these are highly abbreviated "sound bite" notes, but I think you missed the main environmental issue with ethanol, namely that the all-in energy cost of its production (which generally comes from fossil fuels) is greater than its energy content. So to identify it as a renewable resource is pretty misleading (you didn't, but you hinted at it at the end). If not for the massive subsidies paid to corn growers, plus tax benefits for "renewable" fuels, ethanol would cost far more per energy unit than gasoline at the pump and be totally uncompetitive.
(Hydrogen, which you mention at the end, is
also totally bogus as an "alternative" energy source. It's main current
use is as a smokescreen for the Bush administration to put off doing
anything now about CO2 emissions. Hydrogen is not a primary energy
source, because it's not found in energetically usable form on Earth. It
has to be made from some other primary source, such as natural gas.)
Here are a couple of links to recent news articles with references to two energy researchers who reached the conclusion (and counterclaims from USDA and industry). http://www.sfgate.com/cgi-bin/article.cgi?file=/c/a/2005/06/27/MNG1VDF6EM1.DTL (general interest), http://www.news.cornell.edu/releases/Aug01/corn-basedethanol.hrs.html (more technical details). 3. Toyota is right.
When you examine the entire "food chain", inlcuding water, fertilizer,
salinization of soil, energy per mass, etc this it a very poor ecological
substitute for existing fuel.
My responses Thanks to all who wrote in. Last time I wrote about ethanol, I got a lot of guff from folks who worked at oil companies. Now the comments have an environmental flavor. I don't know about all the technical parts. I did look at the articles that #2 referenced above. The articles were not clear about whether increased efficiencies would address these issues. But really, the point of my update was to be descriptive rather than prescriptive. These things are happening now, for better or worse. It's difficult to foresee whether they will succeed, but significant amounts of money are being invested in increased ethanol producing capacity in the US, and there's profit to be made doing it. Eric More comments ... 4. I actually believe that ethanol WILL be the fuel of the future (the Hydrogen economy is a complete crock IMHO, as many academics have recently pointed out). However, I do not believe that ethanol based on foodstocks will succeed. Rather, I believe that ethanol based on sea plants will succeed. Salt water fermentation is actually more efficient than fresh water fermentation (the bio organisms exists). This will lead to production in all equatorial regions, and dramatically simplify shipping routes (essentially North-South routes for whatever the destination). Attached is a rouch write-up and slide set that frames some of the thinking here. The principal author used to be chief inventor for the communist party in Russia. He is very highly trained in the TRIZ methodology of inventive problem solving and directed evolution ie he uses a formal, systematic methodology to derive solutions such as this one.
5.
I
looked back through your archive of weekly articles, and noticed
that we had almost the same exchange back in September, prompted
by a NYT article around then about the economics of E85 that
made the same point about the negative total energy output of
the production process, as well as other aspects of the
economics. (That I could completely forget this exchange from
just 4 months back is another sign of encroaching Alzheimers…)
The fundamental point
about the whole thing, I think, is that the driving force behind
substitution of ethanol for fossil fuel is political – not in a
good way, as in “lets be energy self sufficient” (which this
doesn’t help achieve), but as in “the senators from ADM have
enough clout to force continued subsidies to this otherwise
uneconomical industry”.
Recently California
has phased out use of MTBE as a pollution reducing “oxygenate”
additive in gasoline (due to health concerns), and been
required by the EPA
to replace it with ethanol, although there is evidence that
adding ethanol actually worsens some pollution problems, and
that the pollution issues that originally led to the oxygenate
requirement have been substantially decreased for other reasons.
Again, a political decision, in this case by the white house,
not based in either economics or science.
The bottom line is
that to discuss the trend to increased ethanol use as though
it’s being driven by purely economic considerations leaves out
the main factor in the story, which is politics.
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