The wet-bulb temperature—a measure of heat and humidity—is nearing the limit of human survivability in some regions. At this threshold, the body can’t cool itself through sweating, even in shade with water. As climate change fuels more intense heatwaves, these deadly conditions are becoming more common, threatening health, crops, and infrastructure, especially in densely populated or low-income areas. Experts warn this growing risk demands urgent adaptation and preparedness.
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