The atmospheric humidity levels that NOAA researchers publish continue to trend lower than climate model predictions - however, the mythical runaway global warming that catastrophic global warming (CAGW) alarmists promulgate requires atmospheric humidity to increase
(click on chart to enlarge - data sources)
The IPCC's CAGW hypothesis necessitates that troposphere humidity increases as levels of atmospheric CO2 increase. Simply stated (this is not rocket science):
*Atmospheric warming increases, thus
*Earth's surface warms, thus
*Earth surface water evaporates, thus
*Atmosphere humidity increases, thus
*Atmosphere water vapor increases (i.e. greenhouse gas), thus
*Atmosphere warms further, thus
*Earth's surface warms even more, thus
*More Earth's water evaporates into atmosphere, thus
*A positive feedback loop established, and continues
In fact, as seen, the atmospheric humidity is decreasing over time while CO2 levels increase - the exact opposite of all climate model and "consensus" expert predictions.
And, as noted before, atmospheric temperatures remain flat to slightly cooling over the last 15 years despite the large increase in CO2 levels - again, the exact opposite of model predictions.
Additional greenhouse, climate and temperature charts.