"I want to see natural selection that changes DNA. The things you're talking about already exist."
The change, properly speaking, is in the allele frequencies of populations. The environment will most certainly change which alleles survive, and which perish. Allele changes are by definition changes in the DNA.
Off topic....but which Carolina and what part? (I'd ask about guitars, but I know nothing about them.)
Are you suggesting that red-haired Irishmen are a different species than black-haired Italians?
Good thing -- Otherwise, if we could mix them we'd have hot heads who want to conquer the world. :>)