A new study has issued some troublesome information related to methane hydrates. There is a common understanding that much of the CO2 added to the atmosphere during the recovery from the last Ice Age was vented out of the oceans, principally the Southern Ocean. This study claims to have found evidence that the source of much of that carbon came by way of the melting of methane hydrates. The authors believe this should add to our concerns that a future increase in such melting, on possibly a larger scale, may not be far off. I think this report will generate more controversy than immediate acceptance, but so far there has been little publicity about it nor has much been said in response.
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Another new study describes the way climate will change for North American cities within one generation. It does so in a simple way by transplanting today’s cities to more southerly locations now occupied by others. “Under current high emissions the average urban dweller is going to have to drive more than 500 miles to the south to find a climate like that expected in their home city by 2080.” It’s an interesting tool of conceptualization, tied mainly to current emitting practices, and there is room left for adjustments if mitigating actions are taken.
https://phys.org/news/2019-02-climate-north-american-cities-shift.html
https://phys.org/news/2019-02-climate-north-american-cities-shift.html
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There is new evidence backing theories about the vulnerability of ice shelves to breaking up. “For the first time, a research team co-led by CIRES-based scientists, has directly observed an Antarctic ice shelf bending under the weight of ponding meltwater on top, a phenomenon that may have triggered the 2002 collapse of the Larsen B ice shelf. And ice shelf flexure could potentially impact other vulnerable ice shelves, causing them to break up, quickening the discharge of ice into the ocean and contributing to global sea level rise.” The effect is likely to increase as air temperatures rise.
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An analysis of a major source of carbon emissions in the US that is poorly recognized (Wired). This is a story about the perverse impacts of urban sprawl, which detracts from overall quality of life in a number of other ways. The description is convincing and the article goes on with provision of practical ideas that would help to bring relief.
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Humans are capable of making significant gains in vegetation growth that captures carbon. A close study has found that when real efforts are made to grow forests, reclaim wasteland, improve crop management and so on the actual results are even better than expected for carbon removal and control. While rising CO2 levels are partly spent on natural greening, human activity can do an even better job, and faster. This should encourage more such activity, beside the elimination of practices that are destructive and on balance have an even larger current impact.
https://www.carbonbrief.org/one-third-worlds-new-vegetation-in-china-and-india-satellite-data-shows?
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What to watch for in “Green New Deal” proposals (USA Today). This is the sort of thing I was referring to in a comment made in yesterday’s Climate Letter. The proponents can easily be accused of using climate change as a wedge to help enact their primary goal, which is a radically progressive agenda, and Republicans are already doing exactly that. In order for climate action to be really and truly effective it must first of all be a bi-partisan undertaking, and everyone, in all classes of society, might temporarily be required to make sacrifices that reduce their current, historically extravagant standard of living based on fossil fuels—and yes, the rich much more so than the poor.
Carl