Didn’t read it in the Daily Mail, possibly Uncle Adolf but he had a different view, pockets of civilization populated by tall, blond, blue eyed, intelligent people with lots of workers outside. Always struck me as odd that he was short, brown haired who appeared to believe in inbreading which would not help much.
Anyway back to the point above something bad will happen, probably biological, maybe caused by us, maybe not. Mankind will get over it and adapt – or not.
If we do get over it chances are it will be the outer edges geographically who do so we may all look like pacific islanders or amazonian indians. At least if its the former there will be good rugby and nobody about calling others mongs 🙂