notes on its blog that the idea that the gene for red hair could soon become "totally extinct" is just a hoax. [The disappearing redhead gene is a variant of the old disappearing blonde gene
urban legend.] Nevertheless, Marie Claire does warn that global warming could cause "a dramatic increase in people born with auburn hair."
It's getting this from The Daily Record
, which in turn is getting it from a Dr. Alistair Moffat who works at a genetic testing company. Moffat's reasoning is that "red hair in Scotland, Ireland and the north of England is adaptation to the climate. We do not get enough sun and have to get all the vitamin D we can. If it was to get less cloudy and there was more sun, there would be fewer people carrying the gene."
Moffat seems to be assuming that rising temperatures and more sunshine will make people with red hair less able to reproduce than their non-red counterparts. Presumably this will happen because Gingers will die from skin cancer before they're able to produce babies.
But of course, all this won't happen right away. We'll only see the disappearance of redheads "within a few centuries."
This all sounds like an attempt to offer some sort of hazy scientific justification in support of the disappearing redhead/blonde gene urban legend. Honestly, I think the bigger danger is that global warming will cause the human race itself to go extinct within a few centuries, rather than just redheads specifically.