The nuclear war scenario, according to all known information about nuclear war policies, is not “chunks of the world becoming unlivable.”
The principals in a nuclear conflict do not appear to even have a method to launch just a few nukes in response to a nuclear attacks: they will launch thousands of warheads at hundreds of cities.
The principals in a nuclear conflict do not appear to even have a method to launch just a few nukes in response to a nuclear attacks: they will launch thousands of warheads at hundreds of cities.