hmmm that doesn’t really track imo: the amount of water that planes emit is negligible, and even if they do seed clouds they’re not actually creating significant cloud systems without the moisture in the atmosphere, which absolutely dwarfs anything that planes emit… remember the amount of moisture in the atmosphere is all the rain produced before aviation, and the amount of moisture in the atmosphere emitted by aviation is at most the difference between that rain and the rain since aviation (i’d wager it’s far less than 0.01%)

and seed clouds don’t actually create more clouds overall: they just move them from other locations. clouds are formed when humidity reaches a particular level at a particular layer of the atmosphere which exceeds the airs ability to hold onto it at that level, and the cloud stops forming when when it has reduced the humidity to the level to which it stays in the atmosphere