I realize that UHI affects a relatively small portion of the earth, which is my point. What are the locations whose data is fed into this model? Are these temperatures being taken at on-the-ground sites across the word? Are they just official record stations, such as airports, etc. like we have in the US? Are current temperatures being collected with satellites? Are they being collected at the thermal vents to underwater volcanoes?
Again...I'm not doubting that warming is occurring, but there is some room to question whether temperature readings are biased warm (i.e., warmer than temps already are) in the modern day.