givesomefucks ,

Pre agriculture you need a lot of land to support a small amount of humans.

It’s not like someone walked from Africa to Norway. A group would expand a little North, settle, then another group would move a little further north.

It was a slow gradual migration. So people slowly got used to the changes.

But like you said, the further North the less food, so they had to spread further and further each time.

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