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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Makes no difference. The problem is high altitude carbon emissions which are 4x worse than sea-level. Biofuels are still combustion based.
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True...from that perspective. Electric planes maybe reality in 50 years.
Hydrogen fuel is another option.
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