The heat already kills several people a year here. Mostly old people and easterners who think a little bottle of water is enough for a several mile hike. In winter, maybe. In summer, you need a gallon.

Europe isn't used to the heat. Most places don't have A/C (apparently World Cup Europeans reveled in our A/C). I suspect most people don't realize how fast it "takes it out of you", and once you're dehydrated you're already in danger. I'm used to the heat, and know how to pace myself when I do yardwork (and drink lots of water). I still have no energy when I get back inside (into the A/C), and am pretty useless for an hour or two while my body cools back down. Plus I'm old.

Yes, the body does acclimate some once you've lived here for a few years. But you still need to pay attention. Dehydration happens fast. It sneaks up on you. Sort of like you being full before your stomach tells you you're full, you're dehydrated before you body tells you you're thirsty.

I was reading a few years ago that they are projecting that parts of the Middle East will become uninhabitable. I want to say they were predicting sustained high temps of 130F in the UAE, but I may be a little off on that. The American Southwest also is in jeopardy. We've already run the experiment (emitting greenhouse gases), so now it's just observing what happens. Too late to do much about it, as most climate scientists agree we've passed the tipping point.