Sadly, I've come to the conclusion that current population levels and economic arrangements are simply not sustainable. I had hope for most of my youth that we'd figure something out. Now I think a large scale disruption leading to drastically less people consuming Earth's resources over the next century or so is the only possible future we have.

Exactly, some scientists raised the warning flags but were chastised despite being right. The obvious consequence has been a chilling effect - scientists are now heavily biased to understate the problem and most are somewhere between ultra-conservative and completely silent about impact predictions.