From a scientific perspective there is some indication that a nuclear war could deplete the earth's ozone layer or, less likely, could bring on a new Ice Age - but there is no suggestion that either the created order or mankind would be destroyed in the process.
“They say that it were great reproof to the king to take again what he has given, so that they will not suffer him to have his own good, nor land, nor forfeiture, nor any other good but they ask it from him, or else they take bribes of others to get it for him.”