WE"RE ALL GOING TO DIE!!!
Seriously folks, it could be bad but he lost me when he casually took for granted the destruction of the ozone layer as if that were a given. Further, this is a HUGE country and I can think of a dozen places right now where you could hole up in perpetuity if needed (not that I could get to any of them just this second)
Stay well, be prepared, as they say...