Nearly 34 million people across 65 US cities — roughly one in 10 Americans — live in a place where the built environment makes temperatures feel at least 8 degrees Fahrenheit hotter than it would without that urban sprawl. That’s according to a new study by the nonprofit Climate Central, which mapped the impact of a phenomenon called the urban heat island effect in major cities in the US.
Dark, paved surfaces with little greenery tend to absorb he...