I have a theory, and I have no evidence to back this theory up. The increases in anxiety in the general public over the last decade or so is in large part to people knowing we're on an unsustainable path. We're all collectively marching towards the edge of the cliff to jump off together. More people than ever have anxiety because we subconsciously (or consciously) know this. We're unsustainable with how we pollute an…
The "Club of Rome" report[1] was published in the early 1970s. We've known for a long time. Still, most people probably still don't know, because they are too busy shopping for the latest shoes or cars. [1] https://en.wikipedia.org/wiki/The_Limits_to_Growth
If we may think that it's still modelling our world exactly enough, complete civilisational collapse will probably come in the next couple of decades.