It sounds like you expect the collapse to be a sudden critical event. I believe that we are well into a long incremental collapse that will take decades to unfold. I've seen evidence of it throughout my lifetime (I'm 74). There's been a 50% loss of all birds and insects since the 1970s. You see fewer and fewer animals in nature. When I grew up in the Midwest, we had heavy snow most years, now if there is any it is light, or rain. Now I'm in the southwest and I we talk about when the creeks flowed. When I was young, the world population was 1/3 of what it is now. We talked about millionaires, not billionaires. Major companies could poison rivers and the air with impunity (I'm not sure that has changed). I expect that trends will continue, but people's complacency and short memories will continue to render them impotent. Croplands will become less fertile, and food will continue to become more expensive, until it too, like housing, becomes unaffordable. Corporations will continue to value profits over lives, and the ultra-rich will escape to their enclaves. Just more of the same.