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.
“I trust that the president will try, just give it one more shot, some revolutionary way of not doing this, of bringing all those kids back home safely.”
“Showing up at school already able to read is like showing up at the undertaker's already embalmed: people start worrying about being put out of their jobs.”