Study Warns Extreme Heat Now Limits Daily Life for One-Third of World

A new study led by researchers at The Nature Conservancy warns that one-third of the world’s population now lives in places where extreme heat severely limits daily activity, making even simple summer tasks harder and less safe. The study says rising temperatures are increasingly affecting not only work, but also basic outdoor movement and routine life.

Researchers said the impact is especially severe for older people, whose bodies are less able to cool through sweating. According to the study, adults aged 65 and older now face about 900 hours a year when heat sharply restricts safe outdoor activity, compared with about 600 hours in 1950.

The report found the worst effects in South Asia, Southwest Asia and parts of West Africa, with countries such as India, Pakistan, Bangladesh, Afghanistan, Bahrain, Qatar and Iraq among the hardest hit. Scientists said many of the most affected communities are also among those least responsible for the greenhouse gas emissions driving global warming.

Lead author Luke Parsons said hundreds of millions of people can no longer safely carry out normal outdoor activities during the hottest parts of the year. He said urgent investment is needed in heat warning systems, cooling infrastructure and protections for elderly people and outdoor workers, but stressed that local adaptation alone will not be enough without cutting fossil fuel use. Luke Parsons The Nature Conservancy

The study, published in the journal Environmental Research; health, used 70 years of temperature, humidity and population data to examine how heat affects what people can safely do, not just whether they can survive. Researchers said this offers a more realistic picture of how climate change is reshaping everyday life.

Scientists warned that poorer regions are likely to suffer the most because many people there have limited access to air conditioning, healthcare and climate-resilient infrastructure. In many hot countries, that leaves older adults, labourers and vulnerable families facing the highest risk.

The findings add to growing evidence that extreme heat is no longer a future threat, but an immediate and expanding crisis already shaping daily life for billions.

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