Yea no. Been to Costa Rica many times and no one has AC. People aren’t dying on the streets. My brother in law lived there for 10 years with no AC and it’s hotter, for longer, than my home in the Deep South.
This stuff can and does kill and if you're not aware of it then pay attention: this is one of the more direct consequences of climate change, it may well push zones that are currently marginally habitable right into inhabitable.
Agreed. I would guess some desert areas might not be habitable but that's only a portion of a couple states. You can definitely live in places like Florida without AC.
https://www.weather.gov/tsa/wbgt
https://en.wikipedia.org/wiki/Wet-bulb_temperature
This stuff can and does kill and if you're not aware of it then pay attention: this is one of the more direct consequences of climate change, it may well push zones that are currently marginally habitable right into inhabitable.