"Nuclear Winter"

Would you consider "nuclear winter" (by nuclear war or for instance by eruption of supervolcano) as a chance for White Race?
I was wondering about that, because blacks needs 3x as much food as We, while they don't get enough sun to creat vitamin D.
Also, White Race did survive ice age previously. In fact we were born thanks to ice age, we have white skin which allows us to creat more vitamin D with less sunrays, We have the best adaptation to digest meat and We can endure hunger for long period of time.
Of course lot of us would die in such scenario, but those who would survive, could creat brave new world only with Whites
Jews in shelters would not survive, it was proven already. People with so much of "high esteem" and greed would kill themselves eventually.