I think passenger ships are going to make a comeback at some point in the next 50y. International air travel is one of the few big climate impact vectors with no reasonable substitute. Domestic you have possibility of better all-electric high-speed rail...
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And it’s not either-or. Containing climate change will require both (improving oceanic cargo shipping and human air travel)
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My sense is that air travel is going to take a long time to go after - there is so much upside from solar (&wind) for land based uses, cleaner shipping and supply chain optimization, construction/ building practices. Flying is a red herring
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