Declining Humidity Is Defying Global Warming Models

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Heartland :

Atmospheric relative humidity has substantially declined in recent decades, defying global warming computer models predicting higher amounts of atmospheric water vapor that will exacerbate global warming. The decline in relative humidity indicates global warming will be much more moderate than global warming activists claim.

 

CO2 Has Minimal Impact

 

Carbon dioxide’s impact on global temperatures is not in dispute. As a matter of physics, doubling atmospheric water vapor from pre-Industrial Age levels will directly cause approximately 1 degree Celsius of warming. From the dawn of the Industrial Revolution until today, atmospheric carbon dioxide has risen by merely 40 percent. Accordingly, carbon dioxide has directly caused approximately 0.4 degrees Celsius of warming (actually a little more, as the earlier increases in atmospheric carbon dioxide will trap more long wave radiation than later increases). If global carbon dioxide emissions continue at their current pace, we can expect human-caused carbon dioxide emissions will directly cause at most another 0.6 degrees Celsius this century.

 

Humidity Predictions More Important

 

United Nations computer models, however, predict approximately 2.4 degrees Celsius of 21st century warming. The discrepancy arises because the computer models are programmed to assume that whenever temperatures warm—due to increasing carbon dioxide emissions or other reasons—a small amount of initial warming creates a cascade effect of other factors that induce even more warming.