Talking about electric boats, I am aware of at least one that has circumnavigated the world entirely on solar power. There is another that has traveled a much longer total distance, but so far it has been mostly around Europe, Africa, and the middle east.
Get back to me when a freighter carrying 50,000 tonnes of cargo can cross an ocean without fossil fuels. Lightweight toys created to "prove the concept" are not that useful in the real world.
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