I am now starting to worry about something else, though. The very fact that President Trump has advanced the idea that he might use nuclear weapons, and that reasonable and responsible people are beginning to discuss this as a real possibility, is "normalizing" the possibility of nuclear war - and is thus making it all the more likely.
The best thing to do in the event of an attack, experts say, is get inside, ideally in a basement or interior stairwell that puts as much building material between you and potential radiation as possible. Staying inside for 12 to 24 hours is best, but staying sheltered for at least the first hour is the most important.
“When you’re looking at a high population density area like the Bay Area, you can save hundreds of thousands of people from significant exposure if we just get people inside after the nuclear detonation,” said Brooke Buddemeier, a health physicist at Lawrence Livermore National Laboratory who studies the effects of nuclear detonations.
Unlike most strategists, [Kahn] was entirely willing to posit the form a post-nuclear world might assume. Fallout, for example, would simply be another one of life's many unpleasantnesses and inconveniences, while the "much-ballyhooed" rise in birth defects would not doom mankind to extinction because a majority of survivors would remain unaffected by them. Contaminated food could be designated for consumption by the elderly, who would presumably die before the delayed onset of cancers caused by radioactivity. A degree of even modest preparation – namely, the fallout shelters, evacuation scenarios and civil defense drills now seen as emblematic of the "Cold War" – would give the population both the incentive and the encouragement to rebuild. He even recommended the government offer homeowners insurance against nuclear-bomb damage. Kahn felt that having a strong civil-defense program in place would serve as an additional deterrent, because it would hamper the other side's potential to inflict destruction and thus lessen the attraction of the nuclear option. A willingness to tolerate such possibilities, Kahn argued, might be worth sparing Europe the massive nuclear exchange more likely to occur under the pre-MAD ["mutual assured destruction] doctrine.
In fact, the use of nuclear weapons will really mean the end of the world - the human world, civilization, and what we might say is "the world as we know it."