Climate Letter #1368

Posted on February 22, 2019 by Carl Campbell
More and more wildfires have intensity that is completely uncontrollable.  These have been happening all over the world, linked unmistakably to climate change, and are posing a special threat to populated areas.  Firefighters on the ground can do nothing to stop them.

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https://phys.org/news/2019-02-everythingthe-wildfire-impossible.html
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Other researchers have found ancient evidence that fires have been most violent under climate conditions that have been warm and moist, rather than relatively dry.  Forests that become lush with biomass provide the extra fuel for burning during dry spells.  Reconstructions going back 600,000 years have repeatedly shown this effect.  (We also saw it happen just recently in California.)
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There are good reasons to believe that a rapid transition to 100% renewable energy is technically and economically possible.  “The main barriers are social and political.  The solution requires collective willpower and immediate deployment.”  Australian researchers have found “that shifting to 100 per cent renewables is technically feasible, and at the current rates of deployment [my ital], enough wind and solar could be built by 2032, just 13 years away.”  Elsewhere there are similar opportunities, though maybe not quite that fast.
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A warning from the UN:  The future of food is under ‘severe threat’ due to the rapid of species diversity (The Japan Times).  Biodiversity includes not just species of foods that we eat, which are dwindling, but the many species that are involved in the production of food, and their own life support systems.  Climate change is one of the major threats to relevant biodiversity and is due to become even more severe through mid-century.
https://www.japantimes.co.jp/news/2019/02/22/world/science-health-world/future-food-severe-threat-amid-rapid-decline-species-diversity-u-n-warns/#.XG_YvmRKhdc
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Paleoclimate science:  Why Earth was frozen into a giant snowball about 580 million years ago.  Scientists now think they have found the answer to this mystery.  Remnants of an extreme outflow of volcanic lava have been found, which released massive amounts of both CO2 and fresh rock with timing that was just right.  Once the warming effect of the CO2 subsided the longer-lasting cooling effect of rock weathering would take over.  “The weathering process is especially intense at tropical latitudes. Over timescales of millions to tens of millions of years, the weathered rocks can sequester sufficient carbon dioxide to plunge Earth’s climate into an extreme ice age.”  (The planet was rescued later on from its snowball state by further rounds of volcanism of the ordinary type emitting CO2 but not much rock.)
https://www.eurekalert.org/pub_releases/2019-02/uoh-avb022019.php
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An interview with David Wallace-Wells.  David is a journalist who closely follows climate science, and has recently published a book.  I do not think he exaggerates the dark side of the viewpoints expressed here.
Carl

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