Current state of the water vapour feedback

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The CO2 - water vapour positive climate feedback is real and active. The figure below is showing the meridional-vertical cross-section of the zonally-averaged specific humidity increase based between 1980 and 2018 for ERA5 reanalyses of the European Centre for Medium-range Weather Forecasts (ECMWF). The yearly-average specific humidity at certain grid point was computed for every year between 1980 to 2018 to estimate the linear trend and the difference between the trendline values are plotted.