Climate Letter #1518

The new special report on oceans and ice has been published by the IPCC.  It is loaded with information related to the process of climate change and the need to engage in policies of abatement.  I will give you links to a variety of stories that have different degrees of depth, starting with a quick introduction from Nature:

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A more thorough analysis with a number of charts is provided by Inside Climate News:
For an even more thorough review Carbon Brief has performed in its usual high-quality style, with numerous charts and diagrams.  I will have a follow-up comment on the interactive chart showing sea level rise that is found quite a way down from the top.
–The sea level chart is a linear-style graph using historical data taken from six different sources, two of which, both fairly recently published, have results back to 1900, are very closely matched in their course of numbers from the start, and provide exceptional stability in year-to-year movement.  Before completion they both were in close agreement with satellite data, which only began in 1992 and is now accepted as the one-and-only best source of measurement.  What I see from that pair plus the satellite extension is over a half century of perfect curvature on a steadily accelerating upward pathway.  Starting in 1970 it shows sea level rising 50 mm in 30 years to 2000, and then another 50 mm in just 15 years to 2015.  Using only your eyeballs to extend the curve, it is not hard to imagine the following 50 being in place in a little less than ten years, and then?—but that is something best left to someone properly trained.  In any case, I have never before seen such a clear picture of acceleration of the parabolic type for this phenomenon, which certainly should have great interest for many human populations.
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What happens in South America when forested land is cleared to make room for industrial agriculture? (The Ecologist).  Eastern Paraguay has been almost completely converted in recent decades, making it an ideal example.  “There, 94 percent of arable land is used for cultivating genetically-modified monocultures, primarily soy, which is exported as animal feed.”  Local people are desperately anxious to recover the land, which is often being spoiled by drought as well as poor farming practices.
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Two climate crises from the distant past are compared, both involving greenhouse gas emissions, with lessons for the current experience (Geological Society of America).  It’s shown to be best for ecosystem adaptation or recovery when things like a major discharge of carbon emissions don’t happen too quickly.
Carl

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