Climate Letter #984

Climate change is setting the world on fire.  This post has a global map showing where this year’s fires have been, so far, rated by intensity.  Everywhere the seasons keeps getting longer and the affected areas more widespread.  This may not be the worst year ever, but it has added some unexpected new locations and looks very much like a representation of the new normal.

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Many trees in parts of the US West are dying because conditions are too hot and too dry.  Colorado aspens are especially vulnerable.  Whole forests could be replaced by grasslands by the end of this century, representing the loss of an important carbon sink.
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A comparison of incoming solar radiation with the trend of global warming.  This post by Carbon Brief has a great chart of values for both trends starting in 1880 plus a good explanation of what all is going on.  It even covers things like temperature trends in the stratosphere and measurements of the influx of cosmic rays.  Everything points to greenhouse gas as the primary force behind the warming trend.
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Another nifty graphic shows various paleoclimate relationships that are worthy of attention.  All of the numbers from the 125,000 year glaciation interval are scientifically quite reliable, those from the Pliocene not so much, but it was definitely warmer then and the seas were higher.  We seem to be taking quite a chance by letting CO2 run ahead this way.
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More information about the latest ice core pulled from Antarctica (see CL #982).  We need to see more research that can confirm the correctness of the age and CO2 readings attributed to this ice, or any kind of satisfactory explanation about why the CO2 reading was not higher if the age is right.
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“Trump forest” is a great idea.  Almost everyone can participate one way or another, and the basic concept can be broadened in many ways.

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