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by labster 2436 days ago
More importantly there is tons and tons of water in the atmosphere, even in so-called dry places. There’s just no wiggle room in the water vapor spectral bands, optical path is pretty constant.

We will probably get more water vapor in the future but most of the PWAT ends up in clouds. And that’s where the feedbacks get interesting, cloud height is very important to radiative balance and there are a couple of indirect effects to consider too.