What Technology Could Reduce Heat Deaths? Trees.

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At the same time, American cities are facing a heat crisis: The largest are warming at twice the rate of the planet as a whole.

On an afternoon that felt too sweltering for June, a 14-year-old named Kiara Wright bent over a young honey locust along a busy road in Des Moines, carefully splashing water from two five-gallon buckets into the dry soil. The city was in drought, and abundant water is critical to trees for at least two years after the shock of transplanting.

Earlier in the spring Kiara had helped plant that season’s 500 trees, becoming fond enough of them to name a few: Sparkles, Linden, José. Now she was watering, mulching and pulling weeds for $10 an hour. Over the course of the summer, her small team would also learn about financial literacy and shadow people in various green jobs.

“We grow the trees and we grow the teens,” said Kacie Ballard, who coordinates the…

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