The cliff is not for Earth. Climate will change gradually, segueing smoothly. Mostly. Mass extinctions, sure, but those are normal. The cliff is civilizational

The cliff is not for Earth. Climate will change gradually, segueing smoothly. Mostly. Mass extinctions, sure, but those are normal. The cliff is civilizational collapse, which will happen very fast once a threshold is crossed. Which threshold it will be is uncertain. Ocean ecosystem collapse and mass starvation? Refugees from uninhabitable places exceed 200M, bringing fascists to power, hence war? Civilizational collapse has happened many, many times. Just not worldwide, before. We have seen how it goes: the rich try to cushion it for themselves, hastening the crash.