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Ron

To: Don Green who wrote (644)	11/25/2024 11:15:11 PM
From: Don Green	1 Recommendation of 935

Deadly heat New Scientist Magazine The combined effect of heat and relative humidity can be gauged using a “sweating” thermometer: one wrapped in a damp cloth that allows you to get a reading known as a wet bulb temperature (WBT). This is more realistic in terms of how our bodies cope with heat because high humidity reduces or even stops the ability to sweat and stay cool naturally. Using this method, research published in 2010 concluded that the limit of human survival is a WBT of 35°C (95°F) – equivalent to an ambient temperature of 35°C and 100 per cent humidity or 40°C (104°F) and 75 per cent humidity. Above this, even a healthy person in the shade won’t live longer than 6 hours, with overheating resulting in heat stress, a leading cause of weather-related deaths. In fact, our tolerance to humid heat may be even lower. In 2022, a study looked at how people reacted to heat in real life and suggested the survival limit at 100 per cent humidity is between 30°C (86°F) and 31°C (88°F) WBT. Weng Qihao at the Hong Kong Polytechnic University says that, in such highly humid conditions, even 28°C (82°F) WBT can lead to severe strain and heat stroke. In a recent paper, Weng and his colleagues concluded that most existing measures to define heatwaves fail to capture the danger to humans because they aren’t applicable to all regions and climate conditions. He is calling on scientists to develop a global framework for better assessing these aspects of heatwaves. ¦

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