I was just looking at energy consumption per km travelled, and used this as a source: https://en.m.wikipedia.org/wiki/Energy_efficiency_in_transport https://en

I was just looking at energy consumption per km travelled, and used this as a source: https://en.m.wikipedia.org/wiki/Energy_efficiency_in_transport https://en.m.wikipedia.org/wiki/Energy_efficiency_in_transpo... It's important to note that I'm just talking about an average situation. If a car is a massive gas guzzling thing, it's a much different equation from a micro-electric. I hadn't thought about the differences in high altitude emmissions vs low. If you'd asked me before today if there would be a vig difference, i would have guessed that eventually it all just mixes evenly throughout the atmosphere, regardless of wjere it was emmitted. But after what you wrote, I learnt that this might not be the case (the science is still investigating): https://earthscience.stackexchange.com/questions/9818/why-does-the-emission-of-aircrafts-at-higher-altitudes-have-a-greater-effect-on https://earthscience.stackexchange.com/questions/9818/why-do... And there are a few other potential issues with other pollution aircraft emit at higher levels.