Climate Letter #2134

Can the progress of global temperature increases actually be limited to the UN’s target of 1.5C if aggressive enough action is taken?  My letters this week have been focused on this question, basically demonstrating that a substantial majority of climate scientists and climate scenarios do not support the idea or consider it realistic as a possibility. The 2.0C target is still alive, but its level of expected realization rests at the bottom of a plausibility range that tops out around 3.0C. The higher number always depends on the absence of potential uncertainties that could be detrimental. The IPCC, in support of the UN, has managed to keep the 1.5 target alive by factoring in the successful achievement of large-scale direct capture of carbon from the air.  The required technology has so far been disappointing, even when employed on carbon-rich industrial emission streams.  Rather than to simply abandon the 1.5 target for this reason the UN/IPCC team would certainly be open to new ideas that could help to keep it alive.  One such idea has actually been proposed and lightly promoted. It is now apparently being readied for promotion on a larger scale.  You can read about it in an article published today on the Energy+Mix website, entitled “‘Buried Science’ Shows Fast Carbon Cuts Can Stabilize Temperatures in 3-4 Years.”—https://www.theenergymix.com/2022/02/18/buried-science-shows-fast-carbon-cuts-can-stabilize-temperatures-in-3-4-years/.  It deserves your scrutiny, but can hardly be classified as compelling.

The occasion behind the article was a press briefing yesterday sponsored by a fairly new collaboration of an organization of global journalists called Covering Climate Now, or CCNow, and Scientific American magazine.  The briefing event plus information about the sponsors are covered by this post—https://coveringclimatenow.org/climate-beat-story/the-best-science-you-probably-havent-heard-of/.  The organization has quickly established a great deal of influence or it would not be able to enlist someone like Michael Mann as a scientific partner.  I can’t think of any climate scientist who is called upon more often than Mann for an opinion about some new development affecting our understanding of climate change or its impacts.  The results of yesterday’s webinar should get a decent amount of attention from journalists in the days ahead—some of which might be critical or even harmful.

So, where is this story taking us?  How credible is the information, which upends everything we have been taught about the ability of oceans to absorb CO2 as they grow warmer?  Mann himself appears to have had no knowledge of this new information as recently as September 2020, when he co-authored a report about ocean stratification and its effects. Here is a review of that report in CBS News—https://www.cbsnews.com/news/climate-change-oceans-balance-stronger-storms-marine-life/.  The reviewer was able to interview Mann about many aspects of the report, one lesser detail of which was summarized as follows: “Mann is also keen to focus on the impacts of a detrimental feedback on the carbon cycle. The increased near-surface warming and less downward mixing means that less of the carbon dioxide (CO2) can be absorbed and stored in the ocean. That’s because physics dictates that warmer water holds less CO2, and also, less CO2 can be mixed downward. The result, Mann says, is that more CO2 accumulates in the atmosphere.”  That was 17 months ago. One other interesting remark was given a direct quote in the review (my ital):  “It’s unwise to be complacent given the accumulating scientific evidence that climate change and its impacts may well be in the upper end of the range that climate scientists currently project,” said Mann. 

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Mann will have to deliver some spectacular new information that lends credibility to these claims, and do so quickly. He has put his own reputation on the line. The UN would do well not to endorse the claims before credibility is established, and the same goes for the IPCC. They have both already painted themselves into a corner by making unachievable promises, but at least they had good intentions. They simply cannot afford to get caught up in a more aggressive attempt to fool the public, or the politicians who write the laws, should it fall flat.

Carl

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