“Muller’s views on climate have made him a darling of skeptics,” said Scientific American, “and newly elected Republicans in the House of Representatives, who invited him to testify to the Committee on Science, Space and Technology about his preliminary results.” The Koch Foundation, founded by the billionaire oil brothers who have been major funders of the climate-denial machine, gave BEST a $150,000 grant.
But Muller’s congressional testimony last March didn’t go according to plan. He told them a preliminary analysis suggested that the three main climate models in use today—each of which uses a different estimating technique, and each of which has potential flaws—are all pretty accurate: Global temperatures have gone up considerably over the past century, and the increase has accelerated over the past few decades. Yesterday, BEST confirmed these results and others in its first set of published papers about land temperatures. (Ocean studies will come later.) Using a novel statistical methodology that incorporates more data than other climate models and requires less human judgment about how to handle it (summarized by the Economist here), the BEST team drew several conclusions:
- The earth is indeed getting warmer. Global average land temperatures have risen 0.91 degrees Celsius over the past 50 years. This is “on the high end of the existing range of reconstructions.”
- The rate of increase on land is accelerating. Warming for the entire 20th century clocks in at 0.73 degrees C per century. But over the most recent 40 years, the globe has warmed at a rate of 2.76 degrees C per century.
- Warming has not abated since 1998. The rise in average temperature over the period 1998-2010 is 2.84 degrees C per century.
- The BEST data significantly reduces the uncertainty of the temperature reconstructions. Their estimate of the temperature increase over the past 50 years has an uncertainty of only 0.04 degrees C, compared to a reported uncertainty of 0.13 degrees C in the most recent Intergovernmental Panel on Climate Change report.
- Although many of the temperature measuring stations around the world have large individual uncertainties, taken as a whole the data is quite reliable. The difference in reported averages between stations ranked “okay” and stations ranked “poor” is very small.
- The urban heat island effect—i.e., the theory that rising temperatures around cities might be corrupting the global data—is very small.
In the press release announcing the results, Muller said, “Our biggest surprise was that the new results agreed so closely with the warming values published previously by other teams in the US and the UK.” In other words, climate scientists know what they’re doing after all.
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