water effects weather differently based on whether its vapor (traps infrared) or suspended droplets/crystals as a cloud (reflects infrared)
sulfur is both a greenhouse gas and a condensate for cloud formation
nature is full of examples where you can add more and more of a single factor and suddenly the effect will flip and contribute to the other direction, before reaching a further threshold and flipping the other way
it is not possible to make blanket statements like "Adding water to the atmosphere increases average temperature"
As I understand it, CO2 is one of the few factors that we can all agree is just straighforward, more CO2 more problems. But chaos is tricky, we can only simulate so much.
