At a certain wet bulb temp humans cannot cool themselves off - they die without access to some other means to get cool (like cold water, air conditioning, etc).
> extreme wet-bulb temperatures are relatively rare in most parts of the world
The concern the top-level comment has is that sooner rather than later these cases will not be as rare and so more people will become familiar with this concept.
“The [wet-bulb] temperature reading you get will actually change depending on how humid it is,” says Kristina Dahl, a climate scientist at the Union of Concerned Scientists. “That’s the real purpose, to measure how well we’ll be able to cool ourselves by sweating.”
As far as global warming goes, study results indicate that limiting global warming to 1.5 °C would prevent most of the tropics from reaching the wet-bulb temperature of the human physiological limit of 35 °C. https://www.nature.com/articles/s41561-021-00695-3
Just to be clear, studies also indicate that we will not realistically limit global heating to anything close to 1.5C, unless very drastic actions are taken immediately (actions on a level that would be seen as extremely radical by most people)
