Key words there are recorded human history.
That's only a small fraction of the total history. Can you prove that global warming isn't saving us from the Ice Age that all climatologists agree we should be in (or at least very close to), right now? How devastating would it be if half of our currently inhabitable land was covered with ice? I'm guessing about the same as if half of it was covered with water.
Solid or a liquid, that damn water is gonna get us either way. I think we should start filling rocket ships with water and shooting it into space.