Heatwaves likely to become more common in South Asia: researchers

Published March 26, 2021
Deadly heatwaves in South Asia are likely to become more common in the future, with the region’s exposure to lethal heat stress potentially nearly tripling if global warming isn’t curbed. ─ AFP/File
Deadly heatwaves in South Asia are likely to become more common in the future, with the region’s exposure to lethal heat stress potentially nearly tripling if global warming isn’t curbed. ─ AFP/File

DHAKA: Deadly heatwaves in South Asia are likely to become more common in the future, with the region’s exposure to lethal heat stress potentially nearly tripling if global warming isn’t curbed, researchers said.

But the threat could be halved if the world meets a goal set under the Paris Agreement on climate change to limit warming to 1.5 degrees Celsius above pre-industrial times, researchers said in a study published this week by the American Geophysical Union, an international scientific association.

“The future looks bad for South Asia, but the worst can be avoided by containing warming to as low as possible,” Moetasim Ashfaq, a climate scientist at the US-based Oak Ridge National Laboratory, said in a statement.

Still, with global temperatures already having risen more than one C, “the need for adaptation over South Asia is today, not in the future. It is not a choice anymore”, said Ashfaq, the study’s author.

The Intergovernmental Panel on Climate Change has said global climate-heating emissions must fall by about 45 per cent by 2030, compared to 2010 levels, to limit warming to below 2C, the higher temperature goal in the Paris Agreement.

But updated plans to reduce emissions, submitted by at least 75 nations ahead of planned COP26 UN climate talks in November, barely made a dent in the huge cuts needed to meet the global climate goals, a UN report said last month.

The new study used climate simulations and projected population growth to estimate the number of people who could experience dangerous levels of heat stress at warming levels of 1.5C and 2C.

It looked at the predicted “wet bulb temperature”, which accounts for humidity and temperature and aims to more accurately reflect what people experience on a hot day.

Health experts and scientists say that at a wet bulb temperature of 32C labour becomes unsafe and at 35C the body can no longer cool itself.

If warming hits 2C, the number of South Asians exposed to unsafe temperatures could rise two-fold, and nearly three times as many people could face lethal heat, the study said.

In a region home to a quarter of the world’s population that could have a big impact on the ability of workers to produce crops in breadbasket regions such as West Bengal and Uttar Pradesh in India and Punjab and Sindh in Pakistan, study authors said.

Workers in increasingly steamy cities such as Karachi, Kolkata, Mumbai and Peshawar could also be affected, particularly as many do not have access to air conditioning, the study noted.

Published in Dawn, March 26th, 2021

Opinion

Editorial

Taxing corporates
Updated 25 Jun, 2022

Taxing corporates

The steps taken by the government are reflective of the extremely sorry state of our economic affairs.
Poll security
25 Jun, 2022

Poll security

AS local government elections in Sindh as well as a raft of by-polls for the national and provincial assemblies draw...
Polio concerns
25 Jun, 2022

Polio concerns

THE fact that vaccine-derived poliovirus has been detected in London’s sewage samples for the first time in 40...
Parliament’s imprimatur
Updated 24 Jun, 2022

Parliament’s imprimatur

Implications of ‘mainstreaming’ militants are far-reaching and must be discussed threadbare by the people’s representatives.
Monsoon preparedness
24 Jun, 2022

Monsoon preparedness

THE deaths of four people, among them three children, and the usual post-rain chaos in Karachi on Wednesday, yet...
Balochistan budget
24 Jun, 2022

Balochistan budget

A BUDGET is all about the political choices a government makes. The eight-month-old Mir Abdul Quddus Bizenjo...