"These age groups are also quite vulnerable to heat in ways that we don't expect even at temperatures that we don't think of as particularly warm," first author Andrew Wilson explained.
"While multiple metrics exist to measure humid heat stress, wet-bulb temperature has been identified as an important metric for understanding the impact of heat on human health because it accounts for the critical role of sweat evaporation - the primary mechanism by which the human body cools itself - in maintaining homeostasis under heat exposure," the paper reads.
Around a wet bulb temperature of just 95 degrees Fahrenheit, humans can no longer dissipate heat into the environment and are thus physically incapable of survival when exposed for a sufficient length of time," researchers noted.
Surprisingly, the researchers found that even at much lower wet bulb temperatures of around 75 degrees Fahrenheit - or 88 degrees Fahrenheit with 50 percent humidity - adults between the ages of 18 to 34 were dying from heat-related causes.
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