But percentages in the stock market seem to be more important to efficiently combat climate change.
I know. There's also this:
https://en.wikipedia.org/wiki/Wet-bulb_temperature
But mentioning the actual temperature is less misleading.
With a dry air you can support more than 70º (eg in a Sauna), but with high air humidity, which evite the evaporation cooling by your sweat, even 50ºC result lethal in a short time,
Over 90C dry, 50C wet, 10-15 minutes. Longer/hotter if you take dips in cold water to cool down or if you're Finnish. They sometimes go over 100C, they're used to it.