America's hottest city is nearly unlivable in summer. Can cooling technologies save it?

 Phoenix’s new ‘heat tsar’ is betting on less asphalt, more green canopy and reflective surfaces to cool the sprawling heat island

Temperatures in Phoenix are becoming deadly.
Temperatures in Phoenix are becoming deadly. Photograph: Ralph Freso/Getty Images

Asurge in heat-related deaths amid record-breaking summer temperatures offers a “glimpse into the future” and a stark warning that one of America’s largest cities is already unlivable for some, according to its new heat tsar.

Almost 200 people died from extreme heat in Phoenix in 2020 – the hottest, driest and deadliest summer on record with 53 days topping 110F (43C) compared with a previous high of 33 days. Last year there were fewer scorching days, but the death toll remained staggeringly high, with people experiencing homelessness and addictions dying disproportionately.

Phoenix, the capital of Arizona, is accustomed to a hot desert climate, but day and night temperatures have been rising due to global heating and the city’s unchecked development, which has created a sprawling urban heat island.

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