It is possible that some sort of runaway effect can happen after a tipping point is reached. Many scenarios lead to that. e.g. - AI could have a singularity.

It is possible that some sort of runaway effect can happen after a tipping point is reached. Many scenarios lead to that. e.g. - AI could have a singularity. - Ice reflects heat, so there can be a vicious circle as ice melts. - Ocean currents could suddenly shift into a different pattern. - Any sort of stressor, like global food shortage, can lead to instability and thus nuclear world war over resources - A contagious disease could cause infertility/death globally. Or, say, if the covid vaccine or microplastics had an unexpected delayed effect after a few years We tempt all these risks more and more as we continue living unsustainably