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by ljf 701 days ago
(boring not pick, water is not a green house gas as sea level, but in the upper atmosphere water vapour most certainly does help to trap heat in the system - https://science.nasa.gov/earth/climate-change/steamy-relatio...

This is one of the reasons why methane leaks are so impactful - not only is methane a terrible green house gas, when it decays in the upper atmosphere, it decays into water vapour and CO2)