Climate Letter #991

How the weakening of the jet stream caused by climate change produces extreme weather effects.  Joe Romm explains what scientists have been saying about this chain of causal connections, including predictions perfectly exemplified by Hurricane Harvey.  The reduction of Arctic sea ice is one of the early propellants.

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A second story by Joe Romm takes us through all of the different ways that effects of climate change worsened the storm at each stage of development, like putting it on steroids:
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Other parts of the world have also been hit by extreme flooding in August (Washington Post).  Much higher death tolls have been reported elsewhere, for various reasons, which may also suggest that many Texans can be thankful for having such robust rescue operations in place.
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The Caspian Sea has a different kind of problem—its volume is shrinking.  The world’s largest inland body of water has been losing almost three inches per year for the last two decades.  The sea is fed by major rivers plus local drainage but has no outlet other than evaporation, which has been increasing uncontrollably as temperatures rise.  “With continued warming in the northern hemisphere, one can expect yearly accumulated evaporation rates over the Caspian Sea to continue increasing for the foreseeable future.”
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Dramatic evidence of massive permafrost melting in northern Canada.  Excess carbon that is commonly held in these soils is thereby released into the atmosphere by bacterial action.  Scientists who work in the region call it a “sleeping giant.”
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Trees provide an overwhelming amount of value in urban areas.  The list of important benefits goes on and on, many of them directly tied to monetary expression.  Their prowess in capturing CO2 from the atmosphere is of course one of the foremost.  They offer an opportunity, at very low cost, that no individual or community should overlook.
Carl

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