Canadian mathematician and climate scientist Steve McIntyre has found another striking error in the academic work supporting the case for climate alarmism.
Recall, in August McIntyre found an error in the way NASA was collating the temperature records from 1200 North American monitoring stations operating since the 1870s. NASA admitted the error, acknowledging they had been overstating the warming in North America since 1930 by a factor of 1.75x. (We wrote about the incident here, here, here, and here.)
This week McIntyre got his hands on the source data cited in an influential 2003 paper claiming the Urban Heat Island effect not having an important impact on historical temperature measurements. The article suggestively titled, Assessment of Urban Versus Rural In Situ Surface Temperatures in the Contiguous United States: No Difference Found, claimed:
Contrary to generally accepted wisdom, no statistically significant impact of urbanization could be found in annual temperatures.
Using the same data (sent to him by the author Thomas Peterson) McIntyre this claim to be completely unsupported. Here’s McIntyre’s plot of data, separating urban and rural monitoring stations based on Peterson’s own definition (click to enlarge):
Its painfully obvious to the most casual observer that there’s a strong warming trend among urban stations, and none for the rural ones.
McIntyre cuts the data another way. Rather than using Peterson’s definition of what constitutes an urban station, he looks at stations in cities with NFL teams (he calls them ‘major cities’) versus everything else. Here’s the graph (click to enlarge):