There's also, like... winter. I'm fairly sure there's a calculation somewhere you could determine the number of deaths this will cause with pretty good accuracy.
Solar is never gonna be a complete solution. At the end of the day, we could do it more efficiently by just building suns here on earth for the panels, but of course then you've achieved fusion and you're already generating more than solar could ever hope to. We shouldn't hinge our future on half of a technology.
There's still sun during the winter; you just need more solar panels for the same amount of energy. Also, there tends to be more wind during the winter, so wind power makes a good complement to solar.
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Fusion, I hate to say it, is a pipe dream. Why? Because any fusion reactor loses a ton of energy to fast neutrons, which have the added negative of destroying the reactor. So-called aneutronic fusion (eg using He3) isn't zero neutrons. It's just fewer neutrons.
Stars don't have this problem because they're very large so there's only so far neutrons can go.
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