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Limited agriculture with orchards and berries has probably been happening for a very long time.. either purposefully, or by accident, by bringing back fruits and nuts to where the group was at that time.
Also, land was teeming with food before it was stripped clean by humans over the last centuries. Even the US was described as rich in animal life and birds when it was first colonized by Europeans. They described bird migrations that would fill the entire sky for days and huge numbers of wild turkeys, deer, etc..
Doing that on today's land is much more difficult.
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- Mark
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