Can Geology Overcome Climate Denialism?

A piece in ArsTechnica reports on some research suggesting that conservatives are more likely to respond positively to news about climate change if they are seeing that the world of the past is not the world of the present rather than being shown ideas about what the future will bring. The piece ends with the author, Cathleen O’Grady, pondering the reason for this result:

There’s also the question of why conservatives found the material more persuasive: did it tap into their desire to preserve the past, as Baldwin and Lammers suggest? Or could it be because the past-focused materials showed evidence about what has already happened, which is more persuasive than predictions about what may happen?

In a sense, the crux of the matter is twofold: showing that something is happening, and showing what the cause of that something is. This paper is addressing the first point, and heavens only knows we have lots and lots of examples now to point at, from the decline in the size of the North Polar ice cap to the decline in the volume of the Greenland ice sheet to the change in the ratio of record high to record low temperatures to the changes in hardiness zones for gardeners to changing dates when frozen lakes and rivers thaw out to the increasing incidence of non-storm related flooding of low-lying areas. In point of fact, many conservative communities have notices some of these impacts and are working to ameliorate the problem. But this level of recognition might only result in attempts to deal with a particular symptom and not the underlying disease.

So that second level, seeing the connection between the things you can see changing and the underlying cause, is also important.  The climate community has leaned heavily on their climate models to make the case, but these are not compelling for many in the public, in part because of confusion between the use of retrospective models and predictive models and in part because this then seems like predicting an uncertain future. GG has harped on this before; an alternative is to look at what has happened in the geologic past.  And here we can find that times when the earth was warmer were times when carbon dioxide (and/or methane) was present at higher levels. We even have an example of a moment when atmospheric carbon levels rose at a geologically rapid rate: the Paleocene-Eocene thermal maximum (PETM). We find the ocean becoming more acidic in cores of seep sea sediments, shifts in the forest trees on land, and an extinction event that defines the end of the Paleocene. We also learn that many of the environmental impacts grow more severe the shorter the time period when the carbon is added to the atmosphere: the PETM was triggered by a carbon release over a few to a couple thousand years, with many (probably most) scientists who have worked on this inclined toward the few thousand year end. Higher temperatures were achieved more gradually in the early Eocene climatic optimum, but that event was not associated with such a pronounced extinction record.

Would bringing these geologically relevant examples to the fore help in convincing folks that the core problem here is our increase in CO2 levels?  It sure deserves a chance…

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