A new study found that about a quarter of the world's population has been exposed to the deadly urban heatwaves.
Factors such as concrete and asphalt covering the city's surface, insufficient green space, and an increase in the population in urban areas were intertwined.
The study, published in the Proceedings of the National Academy of Sciences (PNAS) on the 4th (local time), used infrared satellite images to determine the population exposed on days when the annual heat index (WBGT) exceeded 30 degrees. .
We also used the maximum daily heat and humidity measurements from 1983 to 2016 in more than 13,000 cities around the world.
As a result, the cumulative global exposure to heatwaves during the year tripled between 1983 and 2016.
In particular, in 2016, 1.7 billion people, about a quarter of the world's population, suffered from extreme heat for several days.
Although there are differences between cities and regions, researchers are looking for the main reasons for the overall increase in exposure to heat waves in urban population growth and global warming.
In fact, it was revealed that Dhaka, the capital of Bangladesh, suffered extreme heatwave damage from 1983 to 2016 as the population increased rapidly.
Cascade Tuhorske, a research fellow at Columbia University's Earth Research Institute, said, "The damage from heat waves increases the rate of disease transmission and mortality.
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