The humble tree has long protected humans from sickness and even death—and in the modern city, it’s still doing so. As global temperatures rise, so too does the “urban heat island effect”—the tendency for cities to absorb and hold on to the sun’s energy, which is a growing public-health crisis worldwide. On a small scale, the shade under a single tree is an invaluable refuge on a blisteringly hot day. Scaling that effect up, neighborhoods with more tree cover are measurably cooler.
Now research is showing just what an impact this can have on people’s health. A new paper finds that in Los Angeles, planting more trees and deploying more
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