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Meteorological Technology International
Extreme Weather

Heatwaves in South Asia to affect up to half-a-billion people under current trajectory

Dan SymondsBy Dan SymondsJuly 5, 20223 Mins Read
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Heatwaves in India and Pakistan are expected to increase for the rest of the century, affecting up to half a billion people every year, according to a new study from researchers at the University of Gothenburg, Sweden.

In India and Pakistan, heatwaves with temperatures above 40° in the shade are a life-threatening form of extreme weather. Published in the journal Earth’s Future, the study has outlined different scenarios for the consequences of heatwaves in South Asia to the year 2100.

Deliang Chen, professor of physical meteorology at the University of Gothenburg and one of the authors of the article, said, “We established a link between extreme heat and population. In the best scenario, we succeeded in meeting the targets in the Paris Agreement, which added roughly two heatwaves per year, exposing about 200 million people to the heatwaves. But if countries continue to contribute to the greenhouse effect as they are still doing now, clearing and building on land that is actually helping to lower global temperatures, we believe that there could be as many as five more heatwaves per year, with more than half a billion people being exposed to them, by the end of the century.”

Population growth drives emissions

The study identifies the Indo-Gigantic Plains beside the Indus and Ganges rivers as particularly vulnerable. This is a region of high temperatures, and it is densely populated. Deliang Chen points out that the link between heatwaves and population works in both directions. The size of the population affects the number of future heatwaves. A larger population drives emissions up as consumption and transportation increase. Urban planning is also important. If new towns and villages are built in places that are less subject to heatwaves, the number of people affected can be reduced.

“We hope that the leaders in the region such as India and Pakistan read our report and think about it,” said Chen. “In our calculation model, the range for the number of people who will be exposed to heatwaves is large. The actual numbers will depend on the path that these countries choose to take in their urban planning. It is future greenhouse gas and particulate emissions that will determine how many people are actually exposed. We can more than halve the population exposed to intense heatwaves if we reduce emissions so that we reach the targets in the Paris Agreement. Both mitigation and adaptation measures can make a huge difference.”

Heatwaves are already causing major problems in India and Pakistan. Farmers have been hit hard when drought and heat has caused their wheat crops to fail, and their crops have moved to higher altitudes to escape the extreme heat. But this move has resulted in large acreages of trees being cleared, trees that have contributed to lowering temperatures.

“With a larger population, land use increases, which in itself can drive up temperatures further. Each heatwave will result in increased mortality and decreased productivity, since few people can work in 45-degree heat. I fear that if nothing is done, it can ultimately lead to a huge wave of migrations,” added Chen.

To read the study Future Population Exposure to Daytime and Nighttime Heat Waves in South Asia, click here.

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