Any warming caused by additional non-condensing greenhouse gases will be further amplified by the feedback effects of water vapour. This makes our climate very sensitive to even slight changes in greenhouse gas concentrations. Because they have a longer atmospheric lifetimes, non-condensing greenhouse gases provide the initial temperature framework that allows water vapour and clouds to do the majority of the warming. Since water vapour is a condensing greenhouse gas, fluctuations in water vapour content in our atmosphere happen quickly, and are nearly impossible to control directly. However, we can affect atmospheric water vapour levels indirectly by altering the concentration of carbon dioxide and other atmospheric greenhouse gases.

Question: What would earth's climate look like without the warming framework of non-condensing greenhouse gases?

Modeling experiments suggest that with the removal of these non-condensing greenhouse gases, water vapour would condense out of the atmosphere. Earth's average surface temperature would drop by 35°C, and global sea ice coverage would increase from around 4% to close to 50%.