Wet-Bulb 35C Lethality Threshold
conceptNations & Geopolitics
There's a temperature-and-humidity limit past which a healthy person in the shade with water still dies within hours, and parts of the world are starting to hit it.
Who they are
The wet-bulb 35C lethality threshold, a hard physiological limit for the human body.
What they do
The engine treats it as an absolute physical ceiling that no amount of money or technology can bypass.
How it works
Research (Sherwood and Huber, 2010) found that at a 'wet-bulb' temperature of 35C the body can no longer cool itself by sweating, causing fatal overheating within hours regardless of fitness, shade or hydration; such extreme humid-heat events have more than doubled since 1979 and have already been briefly recorded in the Persian Gulf and South Asia, with projections that South Asia and the Middle East face regular lethal conditions by 2050 and eastern China and Brazil by 2070.
Why it matters
It is a hard limit that ends outdoor labor and infrastructure upkeep entirely, permanently voiding the value of affected land - something no financial engineering can escape.
The engine's record — word for word
Sherwood and Huber (2010): TW 35C = absolute physiological limit. Human body cannot dissipate metabolic heat through sweat evaporation. Fatal hyperthermia within hours regardless of fitness, shade, or hydration. Raymond et al (2020): extreme humid heat events have more than doubled since 1979. Weather stations have documented TW 35C exceedances in Persian Gulf, Indus River Valley, South Asia. By 2050: South Asia and Middle East regularly experience lethal conditions. By 2070: Eastern China and Brazil. Hard physical limit no financialization can bypass. Labor productivity drops to zero, infrastructure maintenance ceases, physical asset base permanently void.
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