Human Resilience to Extreme Heat & Humidity 🌡️

I wanted to reiterate some points from my last video, since they are vital for human survival in the face of extreme temperature and humidity conditions, such as those ongoing, that are brutalizing both India and Pakistan.

Satellite imagery and data collection (remote sensing) today showed that regions of India at the surface surpassed 55 C, and even reached 60 C in some parts. This type of heat is not really survivable to either man nor beast or plant.

The key point is that the wet-bulb survivability condition of 35 C with 100% humidity is a theoretical value. In practice, young healthy people exposed to warm-humid conditions can only survive outside of wet-bulb temperatures are lower than about 31 C, and when exposed to hotter-drier conditions, they can only survive wet-bulb equivalents of 25 to 28 C.

Older people, people with underlying health problems, people on medication such as antidepressants (antipsychotics), very young people (babies and toddlers), and the obese are even less tolerant of high heat and high humidity conditions, but studies need to determine exactly how less tolerant they are.

Acclimatization to warm humid climates causes some physiological changes in the human body, such as lowering core body temperature, lowering resting heart rate, and lowering skin temperatures which can make these wet-bulb temperature limits slightly higher.

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