Climate Letter #549

The science behind sea level rise has had an impact in Paris.  Here is a good summary of what is being talked about, as genuine awareness finally sets in.  It is the main reason for all of the newly acquired interest in reducing the ceiling to 1.5C.

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A very recent report from Antarctica has troubling implications.  The revelation that hot rocks and volcanic activity are extensive in the underbelly of West Antarctica suggests that widespread  destabilization and collapse of that entire ice sheet could follow the observed glacial movements at a more rapid pace than what is usually predicted.
Finally, for those interested, here is a site that offers in-depth studies of the dynamic behavior of ice sheets, discussing the prospect of irreversible changes:
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The difference between 2C and 1.5C, a thorough review.  The subject has taken off, and we are sure to keep hearing much about it from now on.  There are many implications, well-covered in this post.  The circular graph that brings the carbon budget into focus is worth a good look.
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Does capturing carbon from the air make sense?  Plenty of effort is being made, as described in this post, and some participants have high hopes.  Any prospect of holding warming to 1.5C is dependent on quickly creating one or more successful processes, not too costly, that will work on a very large scale.
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Big business and big investors are propelling “unstoppable” change.  This writer sees them running ahead of big governments, and he may be right.  Such activity is entirely voluntary, and it seems to be motivated more by practical considerations than pure idealism.  When businesses reduces emissions they save money, gain PR benefits, improve strategic planning capability and much more.
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Exactly the same kind of thing is happening with big cities.  Progress that is actually being accomplished is important but underreported.  This post will help you get caught up.
Carl

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