We’re already at the point that renewables are far cheaper than the alternatives. It’s just the capital costs that are higher (compared to keeping existing FF), but that’s not a huge issue for rich, developed countries.

So rich countries can massively invest in renewables and press their advantage. Ideally, these rich countries also subsidise renewable energy in developing countries (and to some extent, they are). But even without that in many cases it’s cheaper to just skip building a whole FF industry altogether and go straight to renewables.