With rising temperatures, large parts of the world, with millions of inhabitants, threaten to become unpleasant or even unlivable this century.
The human body can get rid of heat in two ways. Blood vessels become wider so that heat can escape through the skin.and that same skin creates sweat that cools by evaporating. That sounds simple, but it's a complex step by step process.
A heat stroke, a severe form of sunstroke, arises when a body overheats and your heart and lungs have to work too hard to pump enough blood to the dilated vessels. If your heart no longer holds up, your blood pressure drops, you get dizzy and start talking incomprehensibly. You get muscle cramps due to salt deficiency. You get confused and you can go bold, but you don't realize you need help.
If too much blood flows to your overheated skin and too little to your organs, a chain reaction will break your cells. A body temperature of 40 degrees Celsius can be fatal. Infants and elderly people have the least chance of survival. When climbing over the years, sweat glands shrink and some of the commonly used drugs suppress the senses; you don't notice that you're thirsty. And if you are dehydrated, you can't sweat anymore.
If you do not succumn to a heart attack, you get symptoms of hallucination and facial loss. You want to tear your clothes off your body because it feels like sandpaper because your nerve endings are on fire. Whether your blood vessels crack and you become unconscious. Then your muscle tissue is affected, including your heart. Your intestines start to leak and toxins get into your blood, that's going to clump. That's a disruption to your vital organs: your kidneys, bladder, and heart. You're on the brink of DEATH.

Hotter than the human body can handle: Pakistan city rages at the highest temperatures in the world. Experts fear that Jacobabad's extreme heat and humidity can aggravate due to climate change — and other cities can join the club. When the full midsummer heat hits Jacobabad, the city draws in as if it was protecting itself from attacks.

Never was it so hot on Earth: 54.4 degrees measured in American Death Valley

Never before did it get as hot on Earth as it was in the U.S. state of California. In Death Valley, a temperature of 54.4 degrees Celsius (130 degrees Fahrenheit) was measured on Friday afternoon. A record, according to experts.

Even the cacti won't survive the Arizona heat records.
A saguaro, the iconic cactus of the American desert, has far more fruit than previous years. It may be a sign that the cactus suffers from extreme heat.
Southwest US has been drying out for years. This year's more extreme than ever: even the cacti are threatening to collapse under a heat wave.

Record Heat in Lapland: 'Scandinavia Is Like An Oven'

Record Heat in Lapland: 'Scandinavia Is Like An Oven'
In our country, the summer does not want to erupt yet, but in the meantime Scandinavia is struggling with a heat wave. In Banak, Norway, it became record heat at 34.3 degrees yesterday. In Kevo in Lapland, the thermometer tapped a temperature of 33.6 degrees on Sunday, for the first time in a hundred years.

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