The meteorology survey course I took back then pretty much blamed water for everything - including the greenhouse effect - and was far more interested in soot and dirt seeding clouds than anything else with carbon in it.
That's still true isn't it? But water increases the earth surface temperature with about 30 degrees C and the first decent one dimensional model (Manabe) gave an additional 2 degrees when CO2 is doubled. That means we have a significant impact. One can argue that the modern climate models don't offer much extra predictive power over the original model, but the original model offers a stark warning.