Seems like the Human Body was designed well enough to adapt to where it was born and grew up...human know-how took care of the more savage swings of climate, via clothing/shelter but the general habitat/climate/altitude can be ‘grown into’
Not necessarily where they grew up but,rather,where their ancestors are from.I'm no scientist but I doubt that it's a coincidence that my skin is as white and pale as can be thanks to the fact that my Irish ancestors saw almost no sunlight whereas someone from Equatorial regions are likely to have dark skin.That's called adaptation...which occurred gradually over many,many thousands of years.