Not this one
If the "political will" ever came about to force a reduction of everyone's environmental impact by 95%, then we'll be living like cavemen. The masses will anyway; not our masters.
And what if you're wrong about that? 95% is what is possible technologically but obviously not realistic politically. But the point is we could make gigantic differences with today's technology and NOT seriously harm civilization. I'd be surprised if a clean energy technology revolution didn't produce more wealth than it loses.