Once a nuke goes off in a major city, we are pretty much guaranteed it from what I understand about multiple cyberpunk-style worlds

Your argument is not wrong in the clinical sense. Just in the sense that it is so obtuse and irrelevant that your insistence that it is the only correct way to view things makes me not take you seriously.

I think you’re being, not only pedantic, but also just wrong. “The world will end” is a perfectly apt description to just about anyone about what is going on. The world will be uninhabitable for A MAJORITY of life that currently exists.

Permian extinction: last time shit like this happened, temps rose 10°C over 10,000’s of years. Still killed 90% of ALL LIFE. To be so arrogant as to presume that the USA collapsing would not have any knock on effects on the rest of the world. To presume that what kills of humans would do nothing to any other life. To presume that that scientist is a moron who just LOVES AMERICA so very much, because why else would he say things that make me feel bad?