missing the whole point entirely
again
if high carbon high sulphur emissions are the cause of a 2dgre increase... then venus with a high carbon high sulphur are not causing a 9500x impact like math suggest should be happening
the reason is that over 150 years when they done ice core and tree ring studies they were only looking at carbon. yep when the chemically analysed ice core they actually deducted h2o out of the equation like it had no impact
to dumb it down
its like saying that studying teeth health revealed stained teeth cause lung cancer because many smokers have stained teeth so so the correlation is visible and it must be the stained teeth thats the cause, because they excluded the smoking from the equation or simply didnt study it or include it in reports
other things is that most studies are actually based on ground level atmosphere from the last 150 years. because its carbon at ground level that gets frozen into ice an sucked into tree's meaning the studies are not really indicating the upper atmosphere numbers
upper atmosphere numbers only began becoming measured less than 50 years ago
so trying to say upper atmosphere must have ben 0.03% 150 years ago but now 0.04% is also a false number
because they had no number for upper atmosphere composition 150 years ago
Well, just lets leave Venus aside, you don't get it on that.
Re water, and the water cycle, the hydrologic cycle.
The effect of Co2 diminishes exponentially as more is added, (with each doubling of Co2) so it ACTUALLY matters less and less.
The water cycle contains within itself not just water vapor, but all cloud phenomena, thus controls the portion of inbound sunlight which is reflected out to space. Hence as you suggest, it is all powerful.