An asteroid, major volcanic event, solar spectacle, anything could reduce us back to the stone age. And there have been cyclical ice-ages with 30k warm/100k cold on record and we are due for another one or over-due. Ice sheet over half of the USA, scary. Ocean algae or Co2, nobody knows, but it happens on a regular basis. Scary.
I am not sure where your point is going, but if it is that 'we should be more concerned with maintenance than growth' I am on the same page. I hate waste and extravagance.