So, the water requirements of corn vary by what end use the corn is put to?
Heh, yeah, and we’d have plenty of electricity if we’d shut off some of them thar computers.
There are no real gains from growing corn for fuel. There is, however, a large cost of water consumed. Whether the land were simply to lie fallow, without irrigation, or whether less water-thirsty crops were grown (corn ethanol requires over 1,500 gallons of water, for every gallon of ethanol produced), there would be still be plenty of crops for food. There are plenty of alternative fuels — natural gas from fracking being the most obvious.