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.

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-cattle-iraq-is-reeling-from-climate-change https://www.pbs.org/newshour/show/rising-temperatures-dying-... [2] https://www.nytimes.com/interactive/2020/07/23/magazine/climate-migration.html 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%"