Aside from global warming
I get what you are saying. But that improvement has been possible only because of global warming. Today we have more energy (=workforce) at our hands than ever before. This has imported things, but it's living on bored time Global warming will start to deteriate our world in multiple ways, I fact it is doing so right now.
A collapse of this system build on sand is a very real possibility. And it is a very real possibility that it will take less than a generation to happen.