26/05/2026 Wet Bulb Temperature of 31°C recorded in Oxfordshire!

Proff.  Haley Fowler only talks about Wet Bulb Temperatures in Pakistan and the Global South. But the problem is that they are already occuring in the UK!

Add to that the misinformation doing the rounds on Facebook. 35°C as a a oimit for human survival under wet bulb conditions is out of date.

Published: 29 November 2023
“A physiological approach for assessing human survivability and liveability to heat in a changing climate.

Jennifer Vanos, Gisel Guzman-Echavarria, …Ollie Jay Show authors
Nature Communications volume 14. (2023)

Abstract
“Most studies projecting human survivability limits to extreme heat with climate change use a 35 °C wet-bulb temperature (Tw) threshold without integrating variations in human physiology. This study applies physiological and biophysical principles for young and older adults, in sun or shade, to improve current estimates of survivability and introduce liveability (maximum safe, sustained activity) under current and future climates. Our physiology-based survival limits show a vast underestimation of risks by the 35 °C Tw model in hot-dry conditions. Updated survivability limits correspond to Tw~25.8–34.1 °C (young) and ~21.9–33.7 °C (old)—0.9–13.1 °C lower than Tw = 35 °C. For older female adults, estimates are ~7.2–13.1 °C lower than 35 °C in dry conditions. Liveability declines with sun exposure and humidity, yet most dramatically with age (2.5–3.0 METs lower for older adults). Reductions in safe activity for younger and older adults between the present and future indicate a stronger impact from aging than warming.”

https://www.nature.com/articles/s41467-023-43121-5

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