Open Mind

Three things stand out about Donald Trump’s hour-long speech at the United Nations. First, he hurled a lot of insults, including insulting the United Nations, all while telling representatives of most of the world’s nations that their countries were on the road to failure. Second, he spent a lot of time (a lot!!) bragging about himself while claiming he wasn’t bragging about himself. Third, when it comes to climate change he went full denial.

He called climate change “the greatest con job ever perpetrated on the world,” and said “All of these predictions made by the United Nations and many others, often for bad reasons were wrong. They were made by stupid people …” But he declared his love for fossil fuels of all kinds, proudly informing us that he has “a little standing order in the White House. Never use the word coal, only use the words clean, beautiful coal.”

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The “climate working group” (CWG), the gang of five which produced the climate report for the Department of Energy, has been dissolved. The report will not be changed in response to the many criticisms received, because the climate working group is no longer working.

According to a spokesperson from DoE,

“DOE determined that the draft report and the public comments it solicited achieved the purpose of the CWG, namely to catalyze broader discussion about the certainties and uncertainties of current climate science,” a DOE spokesperson said. “We will continue to engage in the debate in favor of a more science-based and less ideological conversation around climate science.”

What follows is my opinion:

The statement from the DoE spokeperson is partly true and mostly a lie. Yes it achieved the purpose of the DoE. No, that purpose wasn’t to “catalyze broader discussion.” No, they are not in favor of a more science-based and less ideological conversation about climate science — just the opposite.

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Having declared (in the last post) that in a recent study of sea level data from locations around the world the Bonferroni correction is not an acceptable procedure, I thought it might be a good idea to show how that comes to be.

First, a very simple example. We test data from location “A” for acceleration of sea level rise, and get a p-value of 0.042. That’s less than our critical test value 0.05, so we declare “acceleration is statistically significant.” Another team tests data from location “B” (a different location), getting a p-value of 0.046. This too is less than 0.05, so they too declare statistical significance. Along comes someone who says there were two tests done, so applying the Bonferroni correction requires a modified critical value of 0.05/2 = 0.025. Neither p-value is lower than that, so neither location shows statistically significant acceleration — despite the fact that as individual tests, they both do.

The Bonferroni correction can lead you astray.
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In a recent report about climate change from the U.S. Department of Energy (DoE), the authors state that “U.S. tide gauge measurements reveal no obvious acceleration beyond the historical average rate of sea level rise.” This is false. Judith Curry has defended this statement by pointing to Voortman & DeVos (2025), who analyze tide gauge data and state that

“Statistical tests were run on all selected datasets, taking acceleration of sea level rise as a hypothesis. In both datasets, approximately 95% of the suitable locations show no statistically significant acceleration of the rate of sea level rise.”

This too is false, and I believe I know how they came to this mistaken conclusion.

Consider the tide gauge record from Cedar Key, Florida (yearly values from PSMSL, the Permanent Service for Mean Sea Level) from 1950 to the present:

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I’ve already blogged about the lame treatment of sea level in the new DOE report. It has attracted some attention from those who want to know how the Trump administration is butchering climate science. But — unlike the authors of the DOE report — it seems my readers also want to know what’s really happening to sea level along the coasts of the USA.

If global sea level is accelerting (and it is), then it’s no surprise we see statistically significant acceleration on the east coast and Gulf coast of the U.S., by why not on the west coast?

I tested for recent acceleration at U.S. tide gauge stations by fitting a quadratic to the data since 1970. It’s not the best test, but it’s simple and I think it’s a good one. It raises the question, what is the average acceleration since 1970 of global sea level? I took the tide gauge reconstruction from Frederikse et al. and fit a quadratic to its data since 1970, which estimates the average rate of global sea level acceleration since 1970 to be 0.083 ± 0.024 mm/yr/yr (95% CI).

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A report from the U.S. Dept. of Energy (DOE) (an official U.S. government report) tells us that

U.S. tide gauge measurements reveal no obvious acceleration beyond the historical average rate of sea level rise.

It’s one of the main points of chapter 7 (Changes in Sea Level). But the DOE report is not the origin of this particular falsehood. For instance …

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