Climate Letter #1019

Posted on October 9, 2017 by Carl Campbell
An update on the number and cost of extreme weather and climate events in the US so far in 2017.  Using a detailed base that only began in 1980, this year is poised to break a number of records.  Even the variety of such events has been remarkable—“Before the arrival of Nate, 2017 had seen two incidences of inland flooding; one drought; one episode of unseasonably freezing temperatures that decimated crops; seven severe storm events, including tornadoes; three tropical cyclones; and one wildfire. In each instance, Noaa has calculated that costs will exceed $1bn.”

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–The Tambora eruption of 1815 caused extreme weather conditions that were possibly the worst ever experienced by modern humans all over the world.  The effects are vividly described in this article from Nautilus.
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A review of several new reports concerning the threat of mass extinction, by Tim Radford.  For those who have a strong interest this report contains a number of links to other publications that fill in many of the details.  Keeping up to date is a problem—“Our activities as humans are pushing species to the brink so fast that it’s impossible for conservationists to assess the declines in real time.”
A comparison of the modern warming event to the PETM and other past hyperthermals (Carbon Brief).  The PETM, which happened 55 million years ago, is one of the most famous events in Earth’s climate history.  This post has an excellent explanation of what went on, with simple graphics that help put it in perspective.  One of them shows how much quicker the current pace of carbon release is, which is a worry because of the danger of feedbacks that are poorly understood.  One encouraging thing about this event is that the extinction it caused, while serious, was not one of the world’s five greatest, and that is in spite of the very high temperatures that existed at the time and the relatively rapid rise that was added on.
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Indigenous peoples need better protection, with more firmly established rights.  The lands they have occupied for untold centuries typically are forested or contain other valuable resources which become targets of outside exploitation.  Aside from moral issues they have an important role in protecting against climate change that is now being more clearly recognized (Guardian).
Carl

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