Billions of people could struggle to survive in periods of deadly, humid heat within this century as temperatures rise, particularly in some of the world's largest cities, from Delhi to Shanghai, according to research published on Monday.
Towards the higher end of warming scenarios, potentially lethal combinations of heat and humidity could spread further including into areas such as the U.S. Midwest, the authors of the report said.
It found that around 750 million people could experience one week per year of potentially deadly humid heat if temperatures rise 2 degrees Celsius above preindustrial levels. The world is on track for 2.8C of warming by the year 2100 under current policies, according to the 2022 United Nations Emissions Gap report.and the Gulf already have briefly touched dangerous humid heat in recent years, the study found it will afflict major cities from Lagos, Nigeria, to Chicago, Illinois if the world keeps heating up.
"This will be a critical benchmark for future studies," said atmospheric scientist Jane Baldwin of University of California Irvine who was not involved in the research.
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