I’ve read a few times that clouds are a big problem for climate modelers as they are far more complex in their implications for the climate than my grade school planet heats > evaporation > cloud forms > rain falls understanding of them suggests.

There’s a nice article here on the issue and frustration of clouds for climate modelers by the head of the Royal Meteorological Society here: https://www.carbonbrief.org/guest-post-why-clouds-hold-key-b...