Climate Letter #910

How climate change is affecting human health.  A quite comprehensive and easy-to-read summary report has been published by a consortium of researchers.  John Abraham provides a good review:

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New UN climate talks open today amidst deep changes in leadership.  There is a strong core of representatives who are determined not to let the process bog down, regardless of the backsliders.  “There will be collateral damage to the United States’ businesses if the U.S. becomes a pariah on climate negotiations.”
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When rainfall increases there is a growing risk that levees will overflow or just break.  This simple lesson is being learned the hard way in central parts of the US.  “When overtopping or a breach happens, the resulting flood is often worse than what would have occurred naturally because the levee raises water levels.”
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The increased frequency of intense flooding is clearly connected to climate change.  “Climate scientists explain that as the planet warms, evaporation increases, leading to more moisture in the atmosphere and more precipitation.”  It is the same effect that occurs during hurricanes, originating with the warming of sea surface temperatures, which is where most of that water comes from.
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Even West Africa’s Sahel region is affected by catastrophic flooding.  “Between 1986 and 2005, Burkina Faso registered floods at a rate of little more than one a year. In the 11 years between 2006 and 2016, it was hit by 55 flood events.”  In this case the consequences are not necessarily bad, as farmers have seen benefits.
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A description of all the different kinds of thunderstorms, from the National Severe Storms Laboratory.  This is a neatly presented educational piece.  Watch out for Mesoscale Convective Systems.

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