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The momentum of the solar energy transition
(www.nature.com)
Due to technological trajectories set in motion by past policy, a global irreversible solar tipping point may have passed where solar energy gradually comes to dominate global electricity markets, without any further climate policies
Politics mostly. It would be a solution, but it requires building a ton and building them fast. We can build nuclear power plants in a few years, but it usually takes a decade to work through the legal hassles opponents will put through. When factored in, not worth it anymore. And I am really angry at them because we could already be in a post-fossil fuel without this misguided pseudo-environmentalism.