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At this point, researchers and policy analysts have checked and double-checked future climate scenarios. We know how much carbon dioxide we can emit and still keep the world from getting more than 2ºC warmer, and we can use that to figure out how quickly we need to move away from fossil fuels. And we can figure out a variety of routes to get there, most of them involving replacing fossil fuels with the cheapest renewable energy sources: wind and solar power. From there, it's a simple matter to determine how quickly wind and solar have to grow to get us there.
Wind and solar have become the cheapest sources of new electricity in most countries, and we now have massive economies of scale for their production and installation. We also have decades of experience with managing them effectively. There's little reason to think these renewables shouldn't be poised for explosive growth.
And yet a new study of the history of renewables so far shows that only a handful of countries have ever seen that sort of growth. And even when those countries achieved that growth, it was only for a brief period.
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source https://arstechnica.com/?p=1781737