There's no serious prospect of the whole planet being too 'toxic' for human groups to exist here and there. Even the probable nuclear wars aren't going to leave

There's no serious prospect of the whole planet being too 'toxic' for human groups to exist here and there. Even the probable nuclear wars aren't going to leave everything uninhabitable. The sheer amount of suffering and destruction involved between here and there, human and more-than-human like, will be catastrophic. Everything present-day humans know and love will be gone. The existence of small groups surviving marginally in the crumbling remnants of our our once-magnificent ecosystems is no silver lining worth caring about.