It's not about CO2 emissions, but rather the high-altitude NOx that contributes more to climate change than low-altitude emissions. However, it's debatable whet

It's not about CO2 emissions, but rather the high-altitude NOx that contributes more to climate change than low-altitude emissions. However, it's debatable whether the amount is very significant, at least compared to other sources of NOx. [1] https://en.wikipedia.org/wiki/Environmental_impact_of_aviation#Carbon_dioxide_(CO2) https://en.wikipedia.org/wiki/Environmental_impact_of_aviati...