this post was submitted on 18 Aug 2023
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Per kg-km flying is higher carbon impact than driving, no matter how full the plane is.
It just isn't. A car would need at least 2 passengers to beat a plane, maybe 3-4 depending on the car. Jet engines are incredibly efficient and planes carry a lot of people. If they all hopped in cars, the planet would turn into a smog hellscape.
If you care about personal emissions so much, take a train.
Sorry - I don't expect you to change your own habits or something, this isn't personal. I work in this space, so to me it's just a fact and not a matter of opinion. Air travel results in higher carbon emissions per kg-km than road travel by about an order of magnitude. Even for long haul flights.
The GREET model: https://www.energy.gov/eere/bioenergy/articles/greet-greenhouse-gases-regulated-emissions-and-energy-use-transportation