Climate Letter #1541

Posted on October 28, 2019 by Carl Campbell
New research finds evidence of historical changes in ENSO variability, with an important note relevant to current events (AGU100).  The variability is confirmed by coral records that go back 7000 years.  The key finding of current relevance:  “We find that ENSO variability over the last five decades is ~25% stronger than during the preindustrial. Our results provide empirical support for recent climate model projections showing an intensification of ENSO extremes under greenhouse forcing.”  That means we should anticipate more El Nino events like the one four years ago, or possibly stronger.  La Nina events, also part of ENSO, were not mentioned, nor was there an explanation for how global warming is causing this particular kind of change to happen.

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Is it too late to stop dangerous climate change?  (WIREs Climate Change).  This editorial commentary from the Royal Geographical Society (UK) offers a collection of nine Opinion Articles on that subject, all of them having well-qualified authorship.  “This collection of essays reveals a diversity of ways of thinking about the relationship between climate and humanity, different modes of analysis, and different prognoses for the future, ranging from qualified pessimism through pragmatic realism to qualified hope.”  There is also a summation and personal commentary by the person who represents the Society.  It’s all here to be read, quite lengthy, but you can easily pick and choose items of most personal interest.
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California’s latest wildfire (Reuters).  I’m sure you already know everything about it, but this post, at minimum, can be inserted just for the record.  It also provides a quick answer to the question raised in the preceding story.  Yes, it is clearly too late to prevent dangerous climate change in the form of extreme wildfires in areas of dense human habitation, as represented by this one and others like it, now breaking out one after another.
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All of the world’s great beaches could disappear (CNN travel).  The threat from sea level rise is clear to everyone, but that’s only half the problem.  Nature has intended to simply move the sand inward.  “What it did not, some scientists say, are the buildings that tower over some of the world’s most popular beaches…..In many cases, this real estate that is coveted for its proximity to the beach is disrupting natural processes and in many places, increasing the rate of erosion…..Compounding the problem are the jetties, groins and other man-made structures built to keep sand from moving.”  CNN takes a close look at eight of the world’s most famous beaches and how they are boxed in by construction.
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A new way to remove CO2 from the air has been developed (Massachusetts Institute of Technology).  “The new system can work on the gas at virtually any concentration level, even down to the roughly 400 parts per million currently found in the atmosphere.”  The researchers believe the process has competitive advantages and can be scaled up.  They have set up a company with plans to commercialize the process.
Carl

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