The “Urban Heat Island” effect is an artificial warming of the climate in the center of urban areas due to increased heating by pavement and lack of shade due to loss of tree cover, among other things. This 3-minute YouTube video describes some efforts by big cities like Los Angeles and New York to combat the heating, which is likely to get worse until the current warming trends. You can view it at https://www.youtube.com/watch?v=4bqqbYCfYYs. The EPA also has a lot of information about dealing with city heating at https://www.epa.gov/heat-islands.

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