It’s not about the amount of corn (or any other feed crop) our temperate landmass and arable soil does or more importantly can theoretically grow. It’s about the quantify of fresh water consumed in generating that many acres of growth, the limited amount of that water available, and the fact that spending finite fresh water to produce fuel so we have less carbon isn’t really as neutral a move as the eco crazies think it is.
You should start looking into this theory
Peak water - Wikipedia
There are a couple dozen white papers floating around on how this is the next major economic and ecological crises and could be the source of the next major world wide conflict (including some projections of nuclear exchange).
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