Climate Letter #747

Rising tides are causing “ghost forests” to appear along coastlines.  “The poison that kills the trees is salt, delivered to their roots by rising tides.”

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Where do human activity-based methane emissions come from?  These powerful greenhouse gas emissions have lately been rising at about the same rate as those of CO2, but it is much more difficult to track down the sources.  New research has increased the level of blame that should be placed on oil and gas field operations since about the year 2000, and especially in the last decade.  Some previous hypotheses to the contrary have been discredited.
Extra comment:  Just as a reminder, ice core readings show that methane in the atmosphere was stuck between 350 and 700 ppb for 800,000 years prior to the 18th century.  Since then it has jumped all the way past 1800, all because of an assortment of accelerated human activities.  Potentially much greater amounts of this gas are waiting to be released from several kinds of frozen states buried within the Earth’s crust, which is warming.
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A new way to produce low-carbon jet fuel.  Richard Branson is a backer of this project, calling if a “real game changer,” but there is still more work to be done.  Aviation is one of the biggest question marks standing in the way of achieving a zero-carbon future.
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A deep analysis of China’s transition away from fossil fuels.  The author, who seems exceptionally well informed, sees many reasons for their making the switch apart from concerns about climate.  He believes the commitment is higher than realized, and so also their level of accomplishment to date.  In the past China has often demonstrated its ability to completely change direction on a dime, and may now be doing so once more.
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Large Chinese cities are actively engaged in cleaning up their environment, while downplaying the heavy industry model.  This story complements the one above, and is just as encouraging if not more so.
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So where does the US stand in this same arena?  We have  a big election coming up, two major parties that are diametrical opposites on environmental issues, and polls that are deadlocked, leaving the future direction outlook in limbo.  Voters still treat economic growth as the most salient issue, until proven otherwise.
Carl

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