Climate Letter #1210

How global warming will affect populations in West Africa.  A new study shows that almost everyone will experience “unprecedented discomfort” from heat stress as gains reach 1.5C and especially at 2C.

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–Note:  There is a belt of locations running from West Africa all the way to northwest India that readily become super-heated in mid-summer.  The heat they face in the current early stages of global warming are bad enough for anyone, as this link shows (scroll down).  It’s worth a daily visit at this time of year.  Get familiar with all the viewing options, and how to intuitively translate the colors and convert from C to the more familiar F scale.  The upper end of the range really needs to be extended another ten degrees.
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Joe Romm displays projections of the future likelihood of heatwaves in the US.  (Dr. Romm, who is himself a professional climate scientist, is also an unusually active public communicator.)  This post has numerous links to source materials and is especially noteworthy for its data and commentary about the mind-boggling California heatwave in recent days.
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Overnight temperatures in the summer are warming up even more than those during the day.  The most damaging effects are enumerated in this post from Inside Climate News.
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Further explanation of why the standard carbon budget needs to be reduced.  Carbon Brief provides a more detailed look at the study of future natural carbon emissions that was reported in yesterday’s Climate Letter.  The grounds for predicting them are solid enough to require their inclusion in the total carbon budget that remains leading up to the targets set by the Paris Agreement.  That cuts five or six years off the time allowed for emissions from human activity for staying within either of the two selected targets.  There is a nice little table that shows all the numbers.  Furthermore, it is noted that these natural emissions will not soon end and will continue to add carbon gases and remain a threat even if humans succeed in dropping their part all the way down to zero.
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A Justice Kavanaugh would not be a friend of environmental regulations (Reuters).  He has a long record of taking the side of business interests as they seek to hold down costs.  The Supreme Court would move more firmly toward locking in the newly revised policies of the EPA for a very long time.
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Trump’s trade war means bad news for the world’s deforestation rate.  That’s because China is responding by turning to South America to satisfy its vast demand for soybeans, giving farmers in that area an incentive to clear more forests in order to gain the necessary cropland.
Carl

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