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Wet bulb temperature would be when the climate gets so hot that perspiration will not cool the body down. It’s a real risk in coming years that will result in death, particularly if it combines with peak AC load to black out a grid for several days.

Texas is not there yet, but IIRC this has already happened in India and parts of the Middle East. https://www.kxan.com/news/national-news/what-is-a-wet-bulb-t...

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Sure, I follow you but why would this start killing people in mass?

Wet bulb temp is technically “deadly” in Houston every year with relatively few deaths.

I think the scenario is: power fails so people no longer have AC. I know nothing about how likely that is.

Also, the issue in the article is about water breaks while working outside doing heavy construction labor

Heads up: As your link explains, "wet bulb temperature" refers to the method by which the heat is measured, not to the threshold where it becomes intolerable for humans. That threshold is around 90F at 100% humidity, but the actual weather conditions can yield a wet bulb temperature much higher or lower than that.

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