Climate Letter #779

The Arctic warming anomaly, from the Climate Reanalyzer.  This has been going on for quite some time, and now getting worse than ever.  Some spots are up 20C, or 36F, from the average of just a quarter-century ago.  All of Greenland is extra warm.  (Remember that images at this site keep changing daily.)

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About the lack of “political muscle” that the climate movement holds over US politics.  This article from The Nation helps to explain why debate over climate change has been almost completely missing in this year’s campaign.  The tactics of the denial machine are apparently more powerful than those of the climate movement in broadly affecting the public’s willingness to be responsive.
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China is speaking out against Donald Trump’s climate policies.  This is interesting for what it may mean with respect to the future.  If Trump is elected it will be up to China to take a really aggressive roll in leading the world toward carbon abatement, in total defiance of whatever the US may do, if there is to be any chance of meeting the goals that were set in Paris.  That is not impossible, but how it would further unfold is surely unpredictable.
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We may start hearing more about plans for geoengineering.  A report will be presented at a UN convention in December.  There are influential people who keep saying that when all else fails one or more of the plans must be executed regardless of the cost or risk, so it is best to start preparing.
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Global carbon intensity is falling faster, but not fast enough.  This refers to carbon emissions per unit of GDP, which fell 2.8% last year.  If economies are going to keep growing the requirement is set at annual declines averaging 6.5% in order to meet the Paris 2C limitation.  Observe that the decline last year, which was truly an accomplishment, did nothing to slow the actual increase in CO2 emissions that remained in the atmosphere, which was the greatest ever.  The reason for this was not explained in the story, but I will be watching for it.
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A new study about the effect of changing cloud cover on global warming.  This story is not the easiest to fully  understand, but is one to keep in mind.  The main conclusion is that some effects that have served to retard the pace of warming in recent decades are only temporary.  Professor Stephen Sherwood, who is a much-respected expert in this field, but not one of the authors, says “The real significance of these results is that they make it much more likely that estimates of climate sensitivity based on historical warming have been biased low compared to reality.”

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