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A few problems with the latest study.
1. It applies all the negative environmental factors to raising corn for ethanol to the ethanol without taking into account the byproducts. Every bushel of corn (56 lbs) used for ethanol production produces 17 lbs of DDG (Dried Distiller Grains) that is fed to livestock as high protein feed. That DDG offsets corn that would be feed directly to livestock.
2. It compares raising corn for livestock to leaving the field fallow. It should compare various uses of the corn. Turning corn into ethanol is WAY more energy efficient than feeding it to livestock.
People like to talk about food vs fuel but the reality is animal feed vs fuel.
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