This means our current social structures need to change. We can’t have exponential growth forever. It’s literally not possible on a planet with finite resources.

> And that is before we consider the effects of the second order transition (i.e. going from a growing population to a shrinking population). That in itself wrecks things like pension provision.

Pension provisioning will suck yes. But it’s not an “existential threat to our civilization, if not our species. As much as climate change.” You are drastically overstating the drawbacks to population decline, as evidenced by your immediate moving of the goalposts when probed.