The number of days where extreme heat makes it too dangerously hot to walk the dog, sweep the porch and engage in other ordinary pursuits has doubled around the world over the past 75 years, according to new research.
Scientists determined that on average, those 65 and older experience a month a year when heat prevents them from routine activities. Parts of Asia, Africa, Australia and North America are becoming unlivable for senior citizens, the researchers said. Younger adults also are losing time as climate-driven heat restricts their lives for 50 hours a year.
Overall, more than a third of the global population resides in regions where heat severely affects daily life, according to the peer-reviewed paper published Tuesday in the journal Environmental Research: Health.
While previous research has shown the impact of extreme heat on human health, authors of the new study said it’s the first to document the consequences of rising temperatures on everyday life.
“Extreme heat isn’t just affecting our ability to survive or work physically demanding jobs, but also just to do simple, light, daily tasks,” said Luke Parsons, a climate scientist at nonprofit environmental organization the Nature Conservancy and lead author of the paper.
The researchers analyzed heat and humidity records from 1950 to 2024. They used the United Nations’ Human Development Index, which measures each country’s health and living standards, as a proxy for vulnerability to rising temperatures. The scientists, who developed a physiological model of heat impacts on different age groups, determined when it becomes too hot for people to undertake tasks when exposed to outdoor temperatures in the shade.
In Qatar, for instance, heat now makes it risky for older adults to engage in routine activities for a third of the year. Even 18-to-40-year-olds in that country must curb daily tasks for more than 800 hours a year or 10% of their time.
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