A street fan provides relief on a hot summer day in New York City. Stephen Chernin/Getty ImagesSpend time in a city in summer and you can feel the urban heat rising from the pavement and radiating from buildings. Cities are generally hotter than surrounding rural areas, but even within cities, some residential neighborhoods get dangerously warmer than others just a few miles away. Within these “micro-urban heat islands,” communities can experience heat wave conditions well before officials decla
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