actually, in order to make use of stalks and cobs you would have to completely redesign the machinery used to harvest corn, as those are presently pulverized to return to the soil to replenish the nutrients that gradually leech out of it.......simply not practical.... Right, it is not practicle, which is why we shouldn't be doing it.
next, there is no "net increase" in the use of fossil fuel, as ethanol can be produced using electricity which can be generated from a number of sources and is very seldom generated from fuel which needs to be imported into the country.....even the fuel used on farms to operate machinery is primarily biodiesel at present....Just because it can be doesn't mean it is. By the way, biodiesel is primarily diesel, with from 1-20% vegatable oil added. The best case is 20%, still burning a lot of diesel. Additonaly, 50% of electricity generated in this county is from coal which is a fossil fuel.
finally, there is no significant effect of corn ethanol production on food......most American corn is used as animal feed.....and since ethanol production uses only the sugars in corn, which cattle cannot digest anyway, the brewer's mash that is a by product is actually a preferred cattle feed over raw ground corn..... The animals fed with corn are our food, so that statement makes little sense.
the next most significant use of American corn is corn syrup.....the net result of tripling the cost of corn is a three cent increase in your next can of Coke.....Trippling the cost of food to someone already starving means they can only aford 1/3 as much
there is no significant use of American corn to feed starving third world countries......for one thing, the cost of transporting it is too high, for another half the third world countries won't permit it to be imported because we use genetically altered seeds......