Climate Letter #686

Posted on June 23, 2016 by Carl Campbell
Big cities are acting on their own by forming globe-wide alliances to confront climate change.  This is happening without much publicity, in an atmosphere that seems to lack the kind of intense opposition that so easily infects national governments.  Extra attention can effectively be given to the advantages for public health in addition to climate.  The alliance makes it possible to share ideas and success stories over the widest possible range.  It is an avenue of hope that should be actively supported, and certainly not overlooked.

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Boston is one big city that has good reason to participate:
Dramatic increase in large US wildfires since the 1970s.  The upward trend of temperatures and drought conditions over a longer season, all of which are earmarks of climate change, is held mainly responsible.  The national record for acres burned, set in 2015, is well on its way to being surpassed in 2016.
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Relatively speaking, some good news about methane emissions.  Measurements taken over three decades in northern Alaska show no increase in its methane burden in spite of higher temperatures and thawing permafrost.  “Bacteria that produce methane and bacteria that consume methane will both become more active as temperatures get warmer,” said Steven Wofsy of Harvard University and co-author of the study. “Our study suggests that over the past 30 years, these processes have balanced out in the study area.”  Otherwise, there has been plenty of gain in CO2, which at least is not as extremely potent a greenhouse gas as methane.
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Offshore wind turbines keep getting bigger and more powerful.  The largest deployed so far spans a diameter of 538 feet, which means blades are about half that long.  There is a “likely” chance of spans reaching over 656 feet by 2030, and potentially more yet later on if certain problems can be solved.
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China has enormous unused wind resources available to be mobilized, with a bit of help needed.  The whole electric power system needs to be reformed by taking away incentives that have been given to coal generation.
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A bullish report on perovskite solar cell technology.  From Scientific American, this material has earned a spot on their list of top ten emerging technologies, while admitting there are still some difficulties to address.  The potential economic benefits are shown to be tremendous.  This post has a link to the full list of ten, which includes new-generation batteries.

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