I'm afraid we need several feet of sea level rise and a bunch more super hurricanes before anything gets done. I think some countries will still be burning coal until after we are all dead. A big breakthrough could be a standard Thorium molten salt reactor design that is put in the public domain. Or maybe a standing wave depleted Uranium reactor. We have enough depleted Uranium to last a very long time. Every country now burning coal could construct them cheaply and transition away from coal for economic reasons and because they would put less radiation in the atmosphere than burning the equivalent amount of coal.

I think Bill Gates is trying to do something along those lines.