A new study has revealed that in this century Pakistan، India And within some of the world’s largest cities, more than two billion people will face unbearable heat.
According to a study published in the journal PNAS, some of the world’s largest cities, from New Delhi and Shanghai to Lagos and Chicago, will face the most severe impacts.
According to research from the Penn State College of Health and Human Development, the Purdue University College of Sciences and the Purdue Institute for a Sustainable Future, as the Earth’s temperature rises, billions of people in regions like the U.S. Midwest could experience prolonged heat waves. I will have to struggle to survive.
The situation will become particularly dire for regions such as South Asia which in recent years Climate crisis have already seen extreme heat due to
And if global temperatures rise by two degrees Celsius or more from current levels The heat can be so intense that such areas will not be able to cool themselves naturally.
According to study co-author Matthew Huber of Purdue University: ‘It’s very disturbing. This will result in many people needing emergency medical attention.’
The research found that if temperatures rise two degrees Celsius above industrial levels, about 750 million people could experience one week of deadly humid heat each year.
At three degrees Celsius, more than one and a half billion people will face such risk.
According to the United Nations’ 2022 Emissions Gap Report, the world is on track to increase temperatures by 2.8 degrees Celsius by 2100 under current policies. Although the landmark Paris Agreement, signed by nearly 200 countries, called for efforts to limit warming to 1.5 Celsius.
Although Pakistan, India and the Gulf countries have touched dangerous levels of humid heat in recent years, studies show that other major cities of the world will also be affected if the Earth continues to warm.
Dr Vasiliou said: ‘It’s happening in places we didn’t think about before.’
At temperatures of four degrees Celsius, Yemen’s city of Hodeidah will experience nearly 300 days of potentially unbearable humid heat per year.
To track this kind of moist heat, scientists use a measurement called ‘wet bulb’ temperature. This is done by covering the thermometer with a cloth soaked in water.
The process of water evaporation from clothing mirrors how the human body cools itself by sweating.
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The study, published Monday, builds on previous research by Dr. Huber, George Mason University climatologist Daniel Vasiliou and other scientists, which sought to determine the point at which heat and humidity combine to affect the human body. Increase endurance without the aid of technology such as shade or air conditioning.
In an earlier study conducted in 2010, Dr. Huber suggested that maintaining a wet bulb temperature of 35 degrees Celsius for six or more hours may be a safe threshold for the human body.
Then, if people can’t find a way to keep themselves cool, it is feared that they will suffer from heat stress.
A decade later, a group of American scientists led by Dr. Vasiliou tested Dr. Huber’s theory and placed young, healthy adults in environmental chambers with high wet bulb temperatures.
They found that the range was lower, between 30 and 31 Celsius.
In this study, Dr. Huber and Dr. Vasiliou applied this lower limit to the world under different scenarios of future climate temperature increases, ranging from 1.5 to 4 Celsius.
Environmental scientist Jane Baldwin from the University of California, Irvine, who was not involved in the research, said: ‘This will be an important benchmark for future studies.’
He said: ‘Unfortunately this is a much more dire situation than the 35 Celsius limit.’
Research published on Monday adds to growing concerns about dangerous wet bulb temperatures.
Another study, published last month in Science Advances, used weather station data and climate models to reach similar conclusions, along with Dr Vasiliou’s range of dangerous humid conditions under moderate global warming. The geographic extent and frequency of warming will increase rapidly.
The preparation of this report includes assistance from agencies.
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