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There will always, within our lifetimes, be land that can't be used for grain/corn mass production. Be it the actual landforms that limit the use of modern machine implements, or the indigenous soil that simply can't grow or sustain such crops. As result, there should be production of animals that can use this land; browsers and grazers such as cattle and sheep and bison.
Cattle in a feedlot can be and are fed 'hay' which is the most sustainable natural-grass type large scale crop. Yes, currently most american feedlots use almost entirely corn and grain (and soy), but as demand for such crops are drawn elsewhere, cattle have alternatives and can be raised pasture style on otherwise unproductive land or fed more hay. Chicken and pigs are not as adaptable.
I eat more beef than I really should, and honestly believe that the best in the world is produced locally. I've had my share of bison, also local, which is no more difficult to prepare as long as you acknowledge that you aren't cooking with beef.
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