Summary: Cities across the U.S. broke thousands of heat records this summer, but in many of them, some areas were hotter than others. These areas are known as urban heat islands, which can mean higher energy bills and unsafe conditions for residents. Blair Waltman-Alexin of Austin PBS, in partnership with Austin Vida, reports. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders
