These American cities are roasting the most this summer

Summers in the US are getting hotter. And they’re also getting longer. The heat over the US has been energized by human-caused climate change and that effect can be most felt in cities.  More than 250 million Americans live in urban heat islands with buildings, roads and sidewalks radiating more heat than grass and trees.That can add as much at 20 degrees to already warm temperatures. Learn more about your ad choices. Visit podcastchoices.com/adchoices