> And the experience has been that civilisational collapse is much more likely for the people who don't use fossil fuels.

There's a limited amount of fossil fuels on Earth. We definitely are going to stop using them as a major energy source at some point because of that, the question is if we get to get a choice as to how we reduce and stop using them or let the production curve peak and the economy collapse once that happens if nothing was anticipated. With additional climate change to deal with by that point.