The real question is why does corn ethanol exist? The farms take up an outrageous amount of space for the amount of energy you get back, and a lot of the energy you get from corn ethanol is from the PETROLEUM based fertilizers used to grow it.

I previously calculated that they would need every square inch of land to meet our current energy requirements.... and that was with current farming efficiencies which involve petroleum fertilizers. If they used more sustainable farming methods, they'd probably need an entire other planet.

Corn ethanol is a joke.