[quandrum]

You have it reversed. The color of your skin determines how much UV protection you get. Skin color is 1-1 correlation to the average hours of daylight a population experiences. High melanin skin is required to live in the equatorial regions to prevent over exposure to UV rays. Low melanin skin is required in the northern regions to prevent under exposure to UV rays.

We saw a mass migration of eastern Europeans to the middle east mid 20th century and the result was the catastrophic increase in skin cancer rates.

We saw a mass migration of middle Easterners to great lakes region in the same period and we saw a catastrophic increase in depression rates.