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Why we [might] need fusion power:

a) Shipping. Big container ships *can't* be sail-powered (the largest sailing ships ever are about 1% of the size we'd need). But existing marine nuclear power is a proliferation and/or meltdown risk. If we can make a small fusion reactor, we could make our existing global supply chains carbon-neutral.

b) Continuous industrial processes that can't survive a power glitch, much less nighttime on a windless night (no renewables). There are a lot of those.

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