The stations that make up the surface thermometer data set must be individually adjusted to account for known issues in the data set (e.g., station moves). Some skeptics claim that the warming in the record (e.g., Figure 2.2) is due to these adjustments. We can check this. Berkeley Earth provides a “raw” land data set in which no adjustments are made (located at www.andrewdessler.com/data) and this can be compared to the data with adjustments. Download the data sets and compare them. How big of an impact do the adjustments have? Do the skeptics have a point?

Figure 2.2

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anomaly (°C) temperature 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 MM 1860 1880 1900 1920 1940 1960 1980 Boun 2000 2020