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Climate scientist faces sack for refusing to fly to Germany from Solomon Islands archipelago
(www.theguardian.com)
this post was submitted on 05 Oct 2023
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But we're talking about passengers, not cargo, so the relevant numbers are CO2 per passenger-km.
Which changes the efficiency - because while you can cram people tightly for a 12h flight, you can't do that for a few weeks journey.
https://travelandclimate.org/transport-calculations
https://www.theguardian.com/travel/2006/dec/20/cruises.green
Not when you're hitching a ride on a cargo ship, no, like the person you're replying to said.
But that's not a real alternative - you can't redirect all isn't traffic to hitch a ride in cargo ships.