[Candor7]

I see. Maybe. But the interesting thing about cold is that it seems to be able to come fairly quickly, unlike warming.
But surely not quickly enough to erase populations of ingenuous humans who are trained survivors in hunter and gatherer societies.

[gleeaikin]

Try to visualize six years of nuclear winter. No summer, no vegetation, most animals starved, most trees dead, no nuts, no roots, probably cannibalism as the last resort.