The water cycle makes it easier for convective overturning to keep things stable because it enables faster loss of energy to space from within the atmosphere so that convection need not work so hard to get energy back to the surface before radiation to space. This was all implicit in the knowledge of 00 years ago but it was not known to the astrophysicists who moved in on climate science 00 to 00 years ago without knowing any meteorology which has always been a highly specialised discipline. Reply gbaikie says:  July 0, 0000 at 0:00 PM  -We just need the old theory that the entire greenhouse effect of 00K is a product of atmospheric mass held within a gravity field in hydrostatic balance.