Climate Letter #1427

Climate change is spurring conflict in the Lake Chad region (Thomson Reuters).  “The region bordering Nigeria, Niger, Chad and Cameroon has been hit by a decade-long Islamist insurgency, uprooting 2.5 million people in one of the world’s most neglected crises.….Irregular rains and rising temperatures have spurred on the conflict by causing food shortages and frustration, while fighting has made it harder for people to cope with these natural changes.”  ( The weather maps consistently show current daily temperature highs around 110-115F for this region.)

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The Asian summer monsoon rains have been weakening over the last 80 years (Phys.org).  A new study based on tree ring analysis sees this decline as unprecedented over the last 448 years, resulting in regional droughts and hardships for nearly half of the world’s population.  “The new research finds man-made atmospheric pollutants are likely the reason for the decline.”  This information creates an extra reason for making sharp cuts in the well-known sources of all that pollution.
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Commentary on new research covering the future of tropical cyclones and hurricanes (Mongabay).  Many interesting details from expert reviewers, plus a fine map that shows all the tropical storm tracks over a 20-year period and who gets hit most often on the coasts where they land.
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An analysis of how rainfall events in the US have intensified since 1950 (Climate Central).  This work was based on data from 244 weather stations, making charts from each city interactively available.  Of special interest is the rapid rate of growth in the total number of storms yielding three or more inches.
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New information about the rate of thinning of the West Antarctic ice sheet (The Guardian).  “The West Antarctic ice sheet was stable in 1992 but up to a quarter of its expanse is now thinning…..The current losses are doubling every decade…and sea level rise are now running at the extreme end of projections made just a few years ago.”  That is an extraordinary development, undoubtedly related to the warming of ocean waters caused by the increase in greenhouse gas solely due to human activity.  There is no sign of any slowdown in this warming trend, which is also beginning to affect the much larger East Antarctic ice sheet.
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The CO2 level has been over 415 ppm for four days now, and that is worrisome.  We’ll see what tomorrow brings and make a comment.
Carl

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