Maiya May explores the most deadly kind of weather, heat, in an unlikely place: Portland, Oregon. She revisits the 2021 heat dome, one of the most anomalous weather events ever recorded on earth. In order to understand why some urban settings are hotter than others, she travels to Medellín, Colombia, a city that is leading the revolution against sweltering city temperatures. Then she visits the hottest city in the US, Phoenix, Arizona, to see how we can turn the temperature down even in the most extreme environments.

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