It’s the *cold* temperature I’m talking about. Just as the high temperature is outside the normal range of human livability, so is the cold temperature range of the Arctic.
Ah, but you can dress warmly enough to shut out the extreme cold. Not so with heat, when you're a primitive people.
The Arctic peoples mastered the technology of protecting themselves from their environment thousands of years ago. I don't think the Arab peoples' technology was nearly as effective in protecting them from the extreme heat of their environment.