@gpowerf

I don't know if your intent was to minimize the seriousness of the article, just because most people are only sharing the headline or not, but, it's not really all about natural adaptation, either.

For example:

"There are heat and humidity levels that people cannot physiologically adapt to even if they're healthy, said Kenney, who has studied those limits. His peer-reviewed research findings suggest that the limit for young healthy people is around a wet bulb temperature of 88 degrees Fahrenheit, or 88 degrees at 100 percent relative humidity."

I worked with my kids on a coding challenge for them this summer where they used the official wet bulb calculation(https://journals.ametsoc.org/view/journals/apme/50/11/jamc-d-11-0143.1.xml), took the input from our shaded, patio weather station, calculated the wet bulb temperature and had it sent to our devices 5 times a day along with steps to take at each temperature.

It was over the level "that people cannot physiologically adapt to" most days in July at 12PM and 2PM.

Also from the article:

"Remember your body needs time to recover from heat stress, ideally by sleeping in a cool environment, Stearns said. Without these recovery periods, your body can become less resilient to heat during later exposures and you could be increasing your risk of heat illness, she said.

Air conditioning is your friend, even if you're trying to get your body used to the heat."

It's a pretty big assumption that everyone has unfettered access to AC or "cool environments" to sleep in. Even in my privileged bubble our power goes out for short periods of time almost every day from summer storms, and happened to have been out for most of the afternoon yesterday. Having to rely on an increasingly unreliable grid in order to survive doesn't sound like a great long term solution to climate change.