I red the "mutation" and "evolution" thing, and I couldn't help but laughing.
Everydays, they are millions of DNA mutations happening. Viruses are mutating. Fishes are mutating. WE are mutating. Some mutations lead to diseases, like cancers. Some mutations go unnoticed. However you call it, even a mutation turning out to cause cancer is some sort of evolution. Of course, that's not one great mutation that will give the mutated the ability to breathe underwater. It'll cause his death. Now, think of millions of mutations everydays. One of those mutation cause the human air need into DIOXYDE need, and not oxygen need. Nowadays, people breathing air for dioxyde (CH20 if my memory's still right) won't last a single minute alive. But, imagine a world full of dioxyde. People breathing oxygen won't last very long while people breathing dioxyde will be full healthy.
We are NOT adaptating to the world, neither the world is adaptating to us. There are millions of DNA mutation everydays, most of them goes unnoticed, again, most of those that go noticed are deadly to their wearers. Only a few of them cause changes we can live with. Some of those changes aren't adaptated to the world we live on, and people having them aren't adaptated anymore, so they die. Some others are fully adaptated. That's what we call "evolution". We shouldn't. Any mutation is an evolution. Take a jar, break it. from the time it wasn't broken to the time you've broken it, it has evoluated. But look, now it's broken. Now, take some clay (argil ?), give it the shape of a jar, work it. Then you got a jar. yay. Your clay has evoluated into a jar. God. Let's call it an evolution. You see that, evolution is not good of bad. Evolution is a changement. We're changing everydays. But the whole human specie is NOT. Like tool(?) said, it takes millions of years for a specie to evoluate.
Think of it like that : Someone get a new supagud gene that makes him resistant to a deadly new virus killing everyone. He will be almost the only one to survive. The human beeing is saved because we built underground cities. Here's another problem, there is no light. People in need of lights will probably die. ANd there you are again, having a humanity filled by people that has no need of light. Now, we're getting back to the virus thing. The virus resistant guy has a wife. He fucks a lot. Get some childs. raise them into full grown adults. They do the same. Etc. 20 000 years later, the virus evoluate again, and gain the ability to go underground. Who do you think will survive the new epidemy ? Everyone that was descendant of the virus resistant guy. They will have the ability to live without light, and they'll survive the virus. Here you got a new human "specie".
I'm sure I haven't made myself clear + my post will go unnoticed, but here's what I think is the truth.