Implied Rebuttal Conclusion (so)
It could be okay to use food crops to produce fuel.
Intermediate Conclusion (so)
Diverting food to fuel isn't a radical break with traditional practices.
Evidence
We currently divert food crops to feed livestock.
Evaluate
The big 3 most common moves on Method are Analogies, Faulty Implications, and Alternatives.
This argument seems to involve an Analogy. The author is saying that diverting food crops to produce fuel is analogous to diverting food crops to feed livestock.
It also involves the idea of a Counterexample. The opposing claim is that diverting food crops for fuel would be an unprecedented move, and the author is trying to argue,
Goal
Let's pick any answer that is descriptively true. It will probably comment on the analogy or counterexample.