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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Isn’t shipping responsible for much more co2 emissions than air travel? Like 17% vs <2%
Making ships less dirty + simplifying supply chains would prob make much more difference
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Not on a per-pound-per-mile basis, plus air travel has higher impact emissions because stratosphere altitude emissions cause about 4x more impact for same amount of CO2.
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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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Semi related I’ve for a long time been noodling on the idea of a calculator / search engine for environmental impact. It’s starts easy “how much emissions do i produce to go from London to Paris” but you can tune it - car / regular rail / high speed rail and so on down
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