An Urban Heat Island is a metropolitan area which is significantly warmer than its surroundings. As population centers grow in size , they tend to have a corresponding increase in average temperature. Not to be confused with global warming, scientists refer to this phenomenon as the “Urban Heat Island Effect” (UHIE). There is little controversy in the existence of the UHIE. What is more controversial is whether, and if so how much, this additional warmth affects the (global) temperature record. The current state of the science is that the effect on the global temperature record is small to negligible. More information can be found here.
Urban Heat Island Effect (“UHIE”)
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