If a 'die-off' happens at large scale within a country that has nuclear weapons, everyone on the planet could be involved. For example, they could make a unilat

If a 'die-off' happens at large scale within a country that has nuclear weapons, everyone on the planet could be involved. For example, they could make a unilateral decision to detonate nuclear bombs on the surface of the earth to throw up particulates and cool things down. That would 'suck' for everyone if it didn't work as expected.