I tried the all powerful google to answer this question - but I am not getting the answer I seek. I know we turn darker because the skin produces melanin. The question remains - why darker?
I am a physicist and it would make sense to me that the bodies response would want us to turn whiter- since a higher albedo would reflect more UV radiation. It seems that evolution took the way of absorbing more and more UV radiation by this melanin and then converting it to heat. Which begs the question as well - do black people get hotter than white people given the temperature is constant? Although this a side point to my original question.
What sparked this question was the use of thousand of black balls being dumped into LA's water reservoir in the hopes to reduce evaporation. Again... BLACK balls. This makes no sense to me - why the heck not use white balls to reflect more sunlight?