Category Archives: Science And Society

Mark Steyn And Me

Happy holidays to us. The appellate court basically mooted the flawed rulings against us from last summer, and the new judge (who actually seems to understands the law and the respective cases) will rehear them. Thanks to ACLU, the media organizations and others for their amicus briefs which, while they didn’t address the merits of the case, were helpful in getting this decision. I suspect that it won’t be a happy holiday for Professor Mann.

[Update a while later]

What’s amusing about this is that Mann sort of screwed himself by amending his complaint against us after we’d filed our appeal. That gave the appellate court an excuse to just pass it back to the Superior Court, with the new judge who will likely be much less sympathetic to him.

Climate Models

They seem to be modeling some other planet:

Christy compared the outputs for the tropical troposphere of 73 models used by the IPCC in its latest report with satellite and weather balloon temperature trends since 1979. “The tropics is so important,” Christy explains in an email message, “because that is where models show the clearest and most distinct signal of greenhouse warming-so that is where the comparison should be made (rather than say for temperatures in North Dakota). Plus, the key cloud and water vapor feedback processes occur in the tropics.”

When it comes to simulating the atmospheric temperature trends of the last 35 years, Christy found, all of the IPCC models are running hotter than the actual climate. The IPCC report admits that “most, though not all, of [the climate models] overestimate the observed warming trend in the tropical troposphere during the satellite period 1979-2012.” To defend himself against any accusations of cherry-picking his data, Christy notes that his “comparisons start in 1979, so these are 35-year time series comparisons”-rather longer than the 15-year periods whose importance the IPCC downplays.

Why the discrepancy between the IPCC and Christy? As Georgia Tech climatologist Judith Curry notes, data don’t speak for themselves; researchers have to put them into a context. And your choice of context-say, the year you choose to begin with-can influence your conclusions considerably. While there may be nothing technically wrong with the way the IPCC chose to display its comparison between model data and observation data, Curry observes, “it will mislead the public to infer that climate models are better than we thought.” She adds, “What is wrong is the failure of the IPCC to note the failure of nearly all climate model simulations to reproduce a pause of 15-plus years.”

There is too much that they don’t, and at least for now, can’t capture. And it would be economically insane to base policy on them.