[shawnb576]

The threshold is typically 106F "wet bulb", above which much exposure will kill people, literally begin to cook them. Many parts of the world are hitting this.

Examples:

[1] https://www.pbs.org/newshour/show/rising-temperatures-dying-...

[2] https://www.nytimes.com/interactive/2020/07/23/magazine/clim...

"Today 1% of the world is an unlivable hot zone, by 2070 it may be 19%"