During the last glaciation people were not farmers, they hunted and gathered roots, nuts and berries.
This meant they had to go where the food went. If animals moved to warmer areas to find their food, people had to follow or they starved.
There was no point in staying in an area of arctic tundra in which winter lasted for hundreds or thousands of years if there was nothing to eat.

Leave a Reply

Your email address will not be published. Required fields are marked *