...if we were to make an effort, culturally, to shift over to such a diet? The changes would be all-encompassing and profound. Vast tracts of land are devoted, both here and globally, to the grain- and meat-based diet of America. That would have to change.
Why did mankind (probably) switch to eating these foods? Ease of production, probably. A large game animal, and later, large domesticated animals, can feed quite a few people at one time. Cultivation and harvest of cereals was likely an efficiency issue as well. Both have subsequently been adapted to the techniques of the Industrial Revolution, which holds efficiency up as its Holy Grail.
To convert to a greens/vegetables/fruit-based diet would necessitate taking large amounts of land out of cereal cultivation and putting them into market gardens. Large, carefully managed parklands/rangelands with substantial herds of wild game animals (bison and deer are logical choices, as well as wild sheep and goat species) would have to replace feedlots, ranches and factory farming. These lands could support a broad range of biodiversity, as a matter of course. Today's monoculture farms bear little resemblance to tradional farms, which often had as many as fifteen or twenty different production projects going over the course of a year, providing a system of backups should any given project fail.
I like the idea, personally. It would certainly change the face of our world.
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