Also white people look white as they reflect that light so there skin is the opposite, same for people who are black in that there skin is obsorbing the other light frequencies and so reflecting back not alot and as such appearing black.
Now if you got all the populations and used transport like planes and mixed them all about over the World then stopped having any movement, would the people in the northern and southern climates away from the equator become paler skinned and would those in the equator become darker skinned! Its like that eggs/drugs analogy - this your skin and this is your skin on sun :-).
Still, I would like to know what is the average shade of green per country and how much effect does its lattitude have upon that shade of green. Plants tended not to move as much and as humans have.
So to answear to original question:
Why are Europeans White? Because none of them are Wong :-) and there not actualy white.