Reader mode of Firefox helped me be able to read the content of the article, despite the unacceptable layout.

Here's the short version:
Wet-bulb weather is when, because of a combination of humidity and heat, you can't naturally cool off with things like sweat.
There are certain combinations where the weather only needs to be 25.8C for a health younger person, or 21.9C for an elderly person for "wet-bulb" to be achieved.
Climate change is real, and it's causing more instances of "wet-bulb" weather.
Outside activities may not be possible in the summer in certain parts of the world, people will die, the rich will move.