this post was submitted on 20 May 2026
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Anyone out there with real medical knowledge, or industrial hygiene knowledge, of how much heat a human and their society can take before people just die and society crumbles?

Because looking at the situation from the USA, things are looking grim in India. Severe weather about to get worse and the closure of the straits of hormuz means less power for Air conditioning, no pumped water and no way to handle sewage. All this in a country with lethal air quality levels.

Better yet, is anyone on this site actually there, and have some ground truth they are willing to share.

How much heat can we take before things fall apart and we just die.

I'm not looking for a political discussion, or doomer porn, this is more of a concern for humanity question.

https://yaleclimateconnections.org/2026/05/whats-a-super-el-nino-and-other-el-nino-questions-answered/

https://www.lemonde.fr/en/environment/article/2026/05/20/heat-strokes-are-part-of-the-job-in-delhi-construction-workers-endure-43-c-heat_6753631_114.html

Been doing some digging. Answer seems to be "it depends".
https://www.nbcnews.com/science/environment/how-hot-too-hot-humans-record-temperatures-rcna160261

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[–] HasturInYellow@lemmy.world 2 points 3 days ago

Check this out. It is an indepth look at the effects the closure of hormuz will have on the world and the terrible timing with the strongest el niño in 150 years at least. There is no oil to make fertilizer, pesticides, or to transport the food.

Heat stress causes plants to need MORE of these things to survive.

We are looking at the beginnings of the worst famine in possibly world history.

[–] slazer2au@lemmy.world 10 points 4 days ago* (last edited 4 days ago)

Wet bulb temperature is the phrase you are looking for. Above 35 degrees C in the shade above a particular humidity % and your body can't radiate heat to keep 37 degrees C and starts absorbing it.

[–] Einskjaldi@lemmy.world 1 points 3 days ago

If there's a power outage in that heat, you'll have a lot of problems.

[–] trailee@sh.itjust.works 6 points 4 days ago (2 children)

You might enjoy The Ministry for the Future, by Kim Stanley Robinson. It’s fiction, and written a few years ago, but it begins with heatwaves and crumbling infrastructure in India and you will probably get something out of it.

[–] MrsDoyle@sh.itjust.works 1 points 3 days ago

I got nightmares out of it, the description of desperate people trying to cool off in the water...

[–] MajorMajormajormajor@lemmy.ca 5 points 4 days ago

you will probably get something out of it.

OP:

[–] blarghly@lemmy.world 3 points 4 days ago (1 children)

I mean, probably not. Humans tend to not want to die. So they will stick with these problems for a while, but if people keep dying, the rest will not just sit there and wait to die. They will move somewhere else and figure it out.

[–] hanrahan@slrpnk.net 1 points 3 days ago (2 children)

They will move somewhere else

right, which they are doing now and that already a problem with the assholes out there, imagine a billion more.

[–] blarghly@lemmy.world 1 points 3 days ago

I feel like I don't understand what you are saying. Could you rephrase?

[–] HasturInYellow@lemmy.world 1 points 3 days ago

They will be met with machine guns held by hungry soldiers.

[–] DougPiranha42@lemmy.world 2 points 4 days ago

The reason why I don’t think there can be a definitive answer to your question is that wealth, infrastructure and healthcare can do a lot to mitigate the issues with deadly heatwaves.
In a region with no AC, no potable water, and no healthcare, society probably wouldn’t survive a week with wet bulb temperatures above 35C for more than 8 hours every day.
So if that happens in an undeveloped region, a lot of people die, but a lot do find some kind of relief that lets them survive. In a developed, industrialized region, like Arizona or Texas, you can have that kind of weather for months, and most people will just hate the heat but otherwise live and work normally. You could picture a hypothetical technically advanced civilization which exists in a climate that is persistently lethal to humans.
Places that face extreme heatwaves need to build countermeasures, but societies tend to be able to do that, even in the global south.

[–] BreadOven@lemmy.world -1 points 4 days ago

I know this is not answering your question at all. But third world is an outdated term and often considered politically incorrect. I've seen imperial core, developing countries, or low-, lower middle-, upper middle- , or high-income countries (depending on the country of course).

[–] devolution@lemmy.world -3 points 4 days ago (1 children)

That's what happens when you drown girls and overwork your society.

[–] hanrahan@slrpnk.net 2 points 3 days ago

No, that's what happens when we emit vast quantities if CO2e and heat the planet so much vast areas that were borderline unlivable become completely unlivable and a billion people will move.