But these things happen over long periods of time. It's not like China catches on fire and everyone burns to death (tongue in cheek). People get uncomfortable, natural disaster increase, so they migrate. At some point either migration itself becomes an issue, or the last of the poor are tired of being left behind and mass migrate, perhaps violently. So, a collapse is possible, but I think of it as more of a slow lean than a collapse, if it were to happen. And even that would take decades if not centuries. Civilization collapse is inevitable, we know that from the fact a stars life is finite, among other things. That shouldn't prevent anyone from trying to live a happy life, and passing on teachings to the next generation.