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This may be taking things off topic but I've heard recent opinion that our white skin has nothing to do with environment. There were darker skinned people in Europe at one time. The theory is that it has more to do with group selection theory. Happenstancially there was a people whose skin was lighter who performed better. Their better performance led to them winning out over darker colored people almost entirely but not perfectly. As the two groups mixed the lighter skin became associated with better personal performance and so the lighter skinned people became sexually desirable and there ended up a perpetual sexual pressure for lighter and lighter skin.

This is the theory I heard since there was recent questioning of how useful light skin actually is. Apparently it doesn't do that much for vitamin D.

Really your greatest selection pressure is your fellow man, not the environment. Your fellow man is just as likely to kill you as the environment is. Your fellow man also determines your social standing and thus impacts sexual advantages within their society and economic opportunities. We say that culture is downstream from genetics but really genetics is also downstream from culture as well. They create a loop and either that loop carries you somewhere good or it doesn't. What we see of those with southern human genes is it doesn't lead them somewhere good and culture continues to be dysgenic, while our culture continues to be eugenic as long as it is left to itself. Thus we've been pushed into a divide. So on skin color it's probably because our culture preferred it.

This is why taking back control of culture is important. We are actually at a huge genetic disadvantage if we don't reestablish culture on our terms.