Why are Iceland, Norway, Sweden, & Finland the most sparsely populated areas in Europe? (Use climate and pop density maps)

Iceland, Norway, Sweden, and Finland are the most sparsely populated areas in Europe because a large part of their territory is considered subartic.

Explanation:

The subarctic or subpolar climate is characterized by long and very cold winters and short and mild summers. The winters are bitterly cold and it makes it difficult for human communities to grow into larger settlements because the growing season is short and there is not much capacity for agricultural production. There is also not a lot of rainfall in subarctic regions of the world which makes it difficult to irrigate crops.