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> we've literally been doing this for thousands of years
Because we have. The whole environmental narrative about what is "natural" is completely ahistoric.
Do you know what is truly "natural"? Well, just go out to a meadow and try to find anything edible there. Maybe a frog, maybe some grass, maybe some tiny fruits.
But this is how homo sapiens lived for the last 1.8 million years! This occasionally comes back in various "paleo" diets.