You don't get my point. "Everyone is making progress, in a world largely dominated by fossil fuels".
Renewables are making progress with the help of fossil fuels. We don't know how it will be without it, because we haven't tried. We as "the global economy", obviously.
In the meantime batteries + solar or wind can be built quickly and hooked up pretty much anywhere.
Even if we had nuclear fusion, solar+batteries could still win on cost and time to deploy!