Portillo writes:
I can understand the argument. But what Im saying is what exactly are humans going to evolve to, what kind of human or species?
It would be fascinating to discuss what selection pressures humans are and will be subjected to and what changes they might cause, but I think the most accurate answer would be, "We don't know."
Natural selection creates tall, short, dark skinned, white skinned humans, but that is not evolution.
But that
*is* evolution. Expressed slightly more completely, you could say that evolution is natural selection operating upon inherent variation augmented by new mutations.
I think what you probably meant is that height and skin color by themselves are not sufficient evolution to create a new species, probably true under most circumstances. But the more two populations evolve separately the more different they become, and at some point their ability to interbreed declines to the point where we label them two different species.
--Percy