In economics, the idea goes by the name of the
Production Possibilities Curve, but several other names are used, like the
Production Probability Frontier and the
Guns-And-Butter Curve. (The linked page that briefly describes it also cites Herman Göring as the source of the term "Guns and Butter".)
It's simple to understand. You have a given amount of money to spend on Guns and Butter ... or, in the case of agricultural use, Food and Fuel. When you plot one of them as the X variable and the other one as the Y variable, you get a stereotypical-looking curve (or line, depending on how you graph it).
Sure, it's possible to modify the curve, to push it outward. As JohnWxy posted, by eliminating cotton tax breaks, some of the farmland will be freed to grow sugar cane, which is more efficient than corn, and will produce more ethanol. Well, that's provided the farmers choose to grow sugar cane, but it's a good bet that many of them will if the price of sugar cane increases to get top dollar from the ethanol manufacturers.
The problem comes with sustainability. Our economy needs to grow at a minimum of 2.5% per annum to prevent stagnation and depression. Increases in efficiency can help, but only so much. And 2.5%/yr might even be too-low a figure; I've seen 2.8% and even 4% quoted, and it's obviously not a purely scientifically-established number.
Using the
Rule of 70 (or 72) (or 69.3), a 2.5% growth rate per year leads to a doubling time of 70/2.5 years, or 28 years. I will leave it to the ethanol proponents AND detractors to figure out how many doublings our agriculture could sustain. Determining the proper place of ethanol and other cropland-using biofuels will soon become an important part of government policy -- and screaming over the supremacy of the Invisible Hand.
Of course, this doesn't mean we ought not produce ethanol. I strongly support biofuel R&D and production. But everywhere we turn in dealing with our current bunch of cascading problems, we are faced with systems and sustainability problems. We MUST deal with ALL of our problems in a multi-disciplinary way, and make
homeostasis the buzzword du jour; what M. King Hubbert called "The Steady-State Economy" (for more background, see
Hubbert’s Prescription for Survival, A Steady State Economy at the
Energy Bulletin website).
Maintaining homeostasis (though not stagnation!) on the Earth and moving industrial growth into
space would provide the kind of a frontier we need to keep the entrepreneurs happy and productive, and would reduce the time required to open human habitation in space. Sadly, as with alternative energy sources, we could have begun the process some thirty years ago, but we didn't; our business community committed itself to Massive Riches Through Imaginary Wealth (and spent a few idle bucks on computer technology, fortunately). We'd better hope, or, more to the point, we'd better
make sure they don't pull the same stunt with new energy production and homeostasis-achieving economics.
--p!