Why would warmer temperatures lead to less precipitation?

Why would warmer temperatures lead to less precipitation?
It has to do with shifting jet streams and the weather systems they push and pull. It requires some serious curiosity and a willingness to do some reading and learning to appreciate what's going on here. Let me offer a few interesting articles to help orient you. One shouldn't be fooled by cherry picking that last report, read it carefully before you ridicule what's going on. I wish contrarian types would try to understand, this is a for real thing.
What Causes Shifting of Wind & Pressure Belts? http://science.opposingviews.com/causes-shifting-wind-pressure-belts-23865.html All air movements have their roots in pressure differentials in the atmosphere, called pressure gradients. Systematic differences in the Earth's land temperature affect air pressure, and significant patterns of pressure that persist over time are called pressure belts, or wind belts. Wind belts depend on temperature, so temperature changes can move the belts and also change wind patterns. Solar Heating The heat from the sun is strongest at the equator, where solar rays are more intense. .... The end result is that there are large, systematic imbalances in surface temperatures on Earth in addition to smaller, local ones. Pressure Gradients Surface temperatures affect the temperature of the air above them. Because hotter air is less dense, it tends to rise, while the reverse is true for cool air. ... Pressure Belts Some air movements are the result of the systematic pressure gradients that arise from latitudinal changes in the Earth's surface temperature. ... the Hadley Cell, ... Shifting Because both small winds and larger pressure belts are driven by temperature differentials, changes in temperature at the surface can alter them. ...
Global warming may cause East Asian monsoon belt to shift north October 13, 2015 by Bob Yirka http://phys.org/news/2015-10-global-east-asian-monsoon-belt.html (Phys.org)—A small team of researchers with the Chinese Academy of Sciences has conducted a study of organic matter in parts of China and in so doing has concluded that the southern drift of the East Asian monsoon rain belt will reverse itself and travel north—courtesy of global warming. In their paper published in Proceedings of the National Academy of Sciences, the team describes how they studied the past to predict the future of summer monsoon rain patterns over China. For the past couple of decades parts of northern China have been experiencing draughts, which scientists have found is due to the East Asian monsoon belt shifting south—areas in the south, meanwhile, have been experiencing summer flooding. But this trend may not last long, the research team in China suggests, because global warming is likely going to cause the monsoon belt to shift northward again.
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Climate Change & The Jet Stream Published: Nov 1st, 2013 http://www.climatecentral.org/gallery/graphics/climate-change-the-jet-stream The jet stream. It’s what drives our weather patterns, transporting air masses and creating clashing zones for storm formation. This is the time of year when the jet stream in the Northern Hemisphere makes its seasonal southward shift, sparking extreme swings in the weather – such as an EF-4 in Iowa, record rainfall in Texas, and four feet of snow in South Dakota. Scientists have only recently begun to detect changes in the jet stream that may be tied to global warming. Unraveling the complexities of this emerging scientific research is critical to understanding where our weather is headed. As the globe continues to warm, it is already having an effect on the jet stream and corresponding weather patterns, ...
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Global warming increases rain in world's driest areas Not only does the wet get wetter over land, but the driest areas get wetter too Date: March 8, 2016 https://www.sciencedaily.com/releases/2016/03/160308105625.htm New research published today in Nature Climate Change has revealed that in the Earth's dry regions, global warming will bring an overall increase in rainfall and in extreme precipitation events that could lead to flash flooding becoming a more regular event. ... ... Unfortunately for societies, businesses and agricultural activities that exist in arid regions, the expected increase in rainfall over dry areas does not necessarily mean that more water will become available according to the researchers. The additional heat caused by global warming will likely lead to increased evaporation. This means that while there may be more extreme flooding events it may have little impact on overall water storage rates. "The concern with an increased frequency and in particular intensity of extreme precipitation events in areas that are normally dry is that there may not be infrastructure in place to cope with extreme flooding events," said Dr Donat.
Those cascading consequences.