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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10%? I heard <2%. I’ll try to find my sources - please show me yours
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2% is the airlines figure for base emissions. It gets to 10% once you factor in altitude multiplier effect of about 4x-5x I believe. Stratosphere emissions have much stronger radiative forcing effects.
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The analogy is off. Plastic straw bs is based on misinformation around a rounding-error part of a problem (0.5% of oceanic plastic waste)
Air travel is like 10% under proper accounting, and the thinking around it is mostly correct.