True, just look at what they are finding out about ancient South American society in the Amazon. Apparently, at one point humans nearly wiped out most of the Amazon rainforest to have gigantic, almost New York sized metropolitan cities.

most scientists agree it is too late

I mean, "too late" for what is always the question. Folks keep insisting The Apocalypse is next month. And then it doesn't come, and we get a wave of "I guess nothing actually ever happens" during a new record heat wave.

if it takes the entire world falling apart to make the realities undeniably apparent, then so be it

The world is a big place. It's not clear what "falling apart" is even supposed to look like.

I'm seeing people predicting a 4% drop in population because of a particularly harsh El Nino this year. I've been hearing about a looming economic crash that's at least ten years overdue.

At the scope of a human life, all of this is still very gradual change. You're going to be living in the middle of it and not realize how much has changed because you never knew subzero weather in St. Louis or glaciers in Montana were normal.

The talk is of some kind of sharp sudden drop, and not the further churn of a 30,000 year old global extinction event.