this post was submitted on 28 Jan 2025
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(Sorry to be so verbose...)
For what it's worth, I worked on geared turbofans in the jet engine industry. They're more fuel efficient... but also more complicated, so most airlines opt for the simpler (more reliable) designs that use more fuel. This is similar to the problem with leaded fuel, which is still used in a handful of aircraft.
Airplanes could be much greener, there were once economies of scale to ship travel, and relying on altruism at scale just doesn't work at all anyways. Pigouvian taxes have a track record of success. So especially in the short term, the selfish person who decides to "find himself" would look at a high price of flying (which now includes external costs) and decide to not fly at all.
Relying on altruism (and possibly social pressure) isn't working, and that was always what big oil intended. Even homeless people are polluting above sustainable levels. We're giving each other purity tests instead of using very settled economics.