Corn is an efficient way to get energy calories off the land and soybeans are an efficient way of getting protein off the land so we've designed a food system that produces a lot of cheap corn and soybeans resulting in a lot of cheap fast food.
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Fairness forces you – even when you're writing a piece highly critical of say genetically modified food as I have done – to make sure you represent the other side as extensively and as accurately as you possibly can.