Climate Letter #836

New research shows why there is growing potential for destructive storms.  Global warming increases the efficiency of Earth’s atmosphere as a heat engine.  “In this case, increased efficiency isn’t a good thing. It suggests more potential energy is being converted to kinetic energy — energy that is driving atmospheric movement – resulting in a greater potential for destructive storms in regions where the conversion takes place.”

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An interview about changes in weather patterns with an expert climate scientist.  Michael Wehner believes that warming temperatures tend to produce extremes for both precipitation and drought, often in ways that seem paradoxical.
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Major insurance companies are well aware of the growing incidence of extreme weather.  In Europe, for example, the number of devastating floods has more than doubled in 35 years.  Munich Re has become a firm believer in what modern science has to say about climate projections:  “It is amazing how closely these developments fit with the outcomes of climate models.”
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An important discovery about the performance of forests as a carbon sink.  The rate at which they take in and release CO2 varies under the influence of temperature.  When temperatures are rising so does the rate at which they exhale relative to inhaling, thus adding to the CO2 contained in the atmosphere.  This helps to explain why the CO2 increase in ppm is so high during strong El Nino periods such as 2015-16, coincidental with their extra warmth.  One other principal known reason, an increase in wildfire burning, could never explain the full extent of the observed CO2 growth.  This is a “positive” feedback effect that can be added to our list of worries if the warming trend gains speed for any reason.
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Here is an opportunity for China to demonstrate what kind of global leadership role it intends to take in the struggle to reduce carbon emissions.  Chinese institutions are instrumentally involved in financing and building a new wave of coal-fired power plants in the Balkans, heavily criticized by environmentalists.  China has cancelled such plans in its own country in order to improve air quality.  What standards does it visualize in places far from home, and to what extent does the CO2 effect get taken into account?
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How to keep track of all the climate undertakings of the new mafia in Washington.  The Columbia Law School has set up a website that will do just that, much more quickly and completely than I could even think of for this letter.
Carl

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