In corn I think I've found the key to the American food chain. If you look at a fast-food meal a McDonald's meal virtually all the carbon in it – and what we eat is mostly carbon – comes from corn.
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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.