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Because it's pretty expensive and time consuming to build and people really don't like to have a nuclear power plant near them.

This. Even France is not able to double its nuclear power output and go completely climate-neutral this way. Let alone India, China, or Indonesia.

While the time to build is certainly true, is the cost truly more expensive than that of effects of climate change? I suspect not.

South Korea seems to manage building a nuclear power plant in six years or so, they don't have to take decades to get online.

It might be more expensive than the alternative solution to climate change: renewable energy + storage.