In the tropics food production is very good, it's hot, sweet and sloppy. But above the subtropical zone things get very cold in winter. You got no pathagons because the winter kills them off. But you can't grow anything either. It's just this narrow zone which seems to have allowed populations to explode hem sometime starting around ten thousand years ago. And that seems to be what the increasing population size cal rise to the doctrinal religions. The problem happens ran about four thousand, 200 years ago, what's known as the four thousand four point two thousand aa climate event.

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