5,000 years (I noticed you went with the maximum figure, 2-3 is equally likely) is nothing out of a supposed history of hundreds of thousands of years. As for the link on Chinese ice age farming, I don't doubt people take time to settle into an agricultural lifestyle, my point was that, globally-speaking, the advent of agriculture is pretty instantaneous.
The second link reaffirms my point - it seems that climate change, demographics, habitat etc cannot explain such a sudden advent of farming throughout the world, since these things varied hugely from place to place.
I will check out your other link etc tomorrow running out of time here...
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