Carl's comment on the Water vapor, not CO2, controls climate and acts as a negative feedback thread:
What an interesting example of synergy. I recently posted a video on YouTube that outlined the results of an experiment that I performed that showed the same results--the presence of water in a climate system produces an overwhelming negative feedback against diurnal changes in temperature and overall those climate systems that are more humid are on average cooler than arid climates.
Beyond that, and something that I didn't get into in the video, is the fact that the phenomenon of "moist convection" that drives the strong upward convection currents that creates thunderstorms operates in direct opposition to the idea that warm moist air somehow resists the forces of nature that compel it to ascend and cool while it dwells near the surface of the earth driving a heating feedback loop.
From Carl Brehmer's website:
“An essential element of the “greenhouse effect” hypothesis is the positive “water vapor feedback” hypothesis. That is, if something causes an increase in the temperature this will cause an increase in the evaporation of water into water vapor. This new humidity will absorb more of the infrared radiation coming off of the ground. This increased absorption of infrared radiation is believed to warm the air even further. This makes the air able to hold even more water vapor and this result in even more evaporation, which increases the humidity even further and the cycle starts over. This is called a “positive” feedback, since water vapor is believed to amplify atmospheric warming. Being curious about the truth of this hypothesis I designed a simple experiment to study the effect of rising and falling levels of humidity on soil and air temperature and discovered that 1) the addition of water to a climate system exerts a significant negative feedback against temperature changes night and day, 2) water vapor has the same graphical relationship to temperature that insulin has to blood sugar and insulin is known to exert a strong negative feedback against blood sugar levels and 3) over the course of time the addition of water to a climate system causes a perceptible drop in the yearly mean temperature.”
Full script of the above video: Is Water Vapor Feedback Positive or Negative.pdf