Hiya, you may be interested in a few earlier threads on human migration / adaptability to colder climate zones

Human migration

• Why did a lot of humans settle in cold climates, when humans are more comfortable in warmer climates?

• Why did humans leave warm or temperate zones and migrate to colder climates?

• What made native people choose the inhospitable places in which they live?

Staying in the north

• For what reasons did the ancestors of the Inuit choose to settle in such climates, rather than returning South? (ignore the links to other posts - they're a repeat of above)

• Did Eskimo / Inuit / northern peoples know there was a warmer climate to the south?

• Why didn't Inuit/First Nations (Eskimo) peoples move south?

All of these posts have been archived by now, so if you have follow-up questions for any of the users, just post them here and tag their username to notify them