> contrails (aircraft condensation trails) often grow into cirrus clouds that trap heat in the lower atmosphere and significantly add to global warming. Recent estimates show that contrails cause about the same amount of warming each year as all the CO₂ emitted by all flights from 1940 to 2018.

Wow that is… significant. Wild to think that we’re frosting our own snowglobe with contrails so to speak, I would not have thought it would have much of any impact. But I guess contrails ‘seeding’ the formation of larger more significant cirrus clouds does make sense.