Climate Letter #988

Posted on August 25, 2017 by Carl Campbell
A global crisis due to water shortage is rapidly evolving.  This expert says that demand will outstrip supply by 40% by 2030.   Over-use is usually the immediate cause, complicated by pollution and groundwater depletion.  The impact of climate change on supply is also an important factor that keeps growing.

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Bolivia is a country that is among the hardest hit by the drying up of water supplies.  In the high desert whole towns have been abandoned.  Globally, there are a substantial minority of people living on the margins for whom “dangerous climate change” has already reared its ugly head, at just one degree.  That margin will keep expanding, not waiting for two degrees or even 1.5 to become manifest.
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As ocean waters warm fish need more oxygen, but actually less is available.  New research shows that as a result their growth is stunted, as fully explained in the story.  “The researchers estimated fish could reduce in size by as much as 25 per cent for each degree Celsius of warming.”  Would that not have a pronounced effect on human food supply?
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Climate science:  A study of methane sources in a past situation was highly instructive, as geological and biological sources could be separated.  The release from geological sources, like hydrates, was less than expected, which is good news in our current situation because that is something we cannot control.  Emissions currently derived from hard-to-measure anthropogenic sources, like producing and burning fossil fuels, are revealed as greater than the amounts that have been estimated.  These are things we can and should control.
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More on the Exxon denial story.  The top video is current, and quite interesting.  The lower one is a full review of the 2015 revelations as the story was first breaking.
Carl

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