Even though water vapor is the single biggest greenhouse gas contributor to global warming, because it is condensable, it does not control the Earth’s temperature. Instead, the temperature gradients are dependent upon the levels of non-condensable greenhouse gases such as carbon dioxide, et al. This being said, it is known that carbon dioxide and such will remain active in the biosphere for hundreds and thousands of years. This, however, will be a moot point if runaway global warming occurs, because then humanity and much of life on Earth won’t be around to witness it.
Note: A warmer atmosphere holds more moisture. Indeed, water vapor increases by 7% for “every degree Celsius aka 1.8 degrees Fahrenheit” of warming.
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