That's evolution in action, folks. Just look at where each ethnicity originates from, and it makes perfect sense. When you live in northern Europe, you may not get much sun, and have to make the most of it.
An interesting addition to that point is the fact that it's the unique combination of little sun + arable land that set the stage for whiteness to develop in northern Europe. Take northern Native Americans-- they had little sun but also couldn't grow grains and so got plenty of vitamin D through their meat-only diet. There was an article here on HN about this some time ago.
Inuit in particular are especially dark because seal fat is soaked in Vitamin D.
I'm in Scotland, what is this "sun" thing you speak of?
Possibly your skin can make vitamin D from rain ?
I believe we Scots are adapted (or at least attempting to adapt) to produce the necessary vitamins from a combination of alcohol and deep fried food. (e.g. deep fried pizzas and Mars bars).
Fish & Chips actually contain quite a bit of vitamin D!
The Scots have adapted to harsh modern environments containing hazards like the deep fat fryer, but what of more recent technological hazards? (And Hollywood!)
It's a large, blazing fiery mystic beast that is greatly feared for its ability to kill masses of people through silent, sneaky death via waves. Many people are convinced one day it will destroy everything.