They don’t. There is no way for 10 ships to exceed the pollution emitted by 1.4 billion cars. That is a myth.
Ships aren’t built to last forever. Nor can they be guaranteed to run continuously. Maintaining a nuclear reactor is not cheap and certainly not something that would be left unregulated and unmonitored. Many countries wouldn’t allow the ships into port. And there would be few (if any) commercial ports that would even know how to maintain the powerplants. Therefore, at this time, there are too many restrictions and limitations to make them feasible.
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