I don't think at all that we're near the limit of human ingenuity.
The quibble I had was with the "sustainable", which in that context, I read as indefinitely/infinitely sustainable (and it seems other responders have similar issues).
I agree that there should be a lot more human ingenuity ahead of us than behind us (assuming that those seeking power over others, e.g., megalomaniacs and autocrats, don't first destroy us).
That said, productivity of any one thing is certainly never an x^y sort of curve but eventually flattens and becomes asymptotic, if not declining.
Sustained innovation is finding a series of technologies with S-curve growth that can be transitioned away from as they approach their asymptotic limit. Then, society can stay in exponential phase until it hits https://en.wikipedia.org/wiki/Kardashev_scale#Type_III
The quibble I had was with the "sustainable", which in that context, I read as indefinitely/infinitely sustainable (and it seems other responders have similar issues).
I agree that there should be a lot more human ingenuity ahead of us than behind us (assuming that those seeking power over others, e.g., megalomaniacs and autocrats, don't first destroy us).
That said, productivity of any one thing is certainly never an x^y sort of curve but eventually flattens and becomes asymptotic, if not declining.