One problem with hydrogen powered air plannes (which I know from some older articles I had read airbus is aware of) is that emitting small water droplets in the

One problem with hydrogen powered air plannes (which I know from some older articles I had read airbus is aware of) is that emitting small water droplets in the higher atmosphere is actually problematic. I have no good sources but don't articles I have read said it's potentially worse then the CO2 emission of current air plainness. So additional care must be taken to not condense the water from the hydrogen burning into larger potions/prices before emitting it.