When I say "sustainable," I don't just mean eco-friendly. For example, it's not sustainable to keep large arsenals of nuclear armed ICBMs, because even if the probability of them being used in any year is very small, the cumulative probability over long time spans approaches 1. Probably the only way to change this is a radical and global change in governance.

Then yes, there are environmental issues. We don't have a ready answer to microplastics, and they're making us infertile when we're already heading into a demographic cul-de-sac. We'll need more rare earth metals for those electrics cars. Oh, and by the way, those electric cars are still being powered by coal.

Europe is the poster child of renewables, and most of its energy still doesn't come from renewables. Its leading renewable isn't solar or wind; it's wood, and it's not even close. Wider adoption of solar and wind require better battery technology, but batter technology has improved at a notoriously linear rate. It's not going to be any time soon that we see all of Europe's energy come from renewables, and again, they're the best at this.

I'm not saying there's no progress, but that's kind of the point. We need progress to get ahead of some of the problems in our future.