<i><b>The mean reduces to 0.52 °C if stations with less than 1000 population only are included, which documents the UHI. Further evidence of the UHI is given in Figure 2.</b></i>
This kind of analysis of UHI effects on mean temperature <i>trends</i> does not make sense at all.
To acquire any reliable information on the subject, you should plot temperature trends against log population density <i>trends</i>. If it is done, why not do it properly?
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