As more people move to cities and the climate warms, extreme heat could harm and kill more people, reduce worker productivity and hurt economies, study says.
, which assessed more than 13,000 cities from 1983 to 2016, found that global extreme heat exposure increased nearly 200 percent over that time period, a result of population growth, climate change and the fact that city infrastructure absorbs more heat. Nearly a quarter of the world’s population is in areas where extreme heat exposure is rising, the study says.
A separate report published Wednesday on climate change’s health effects suggests the problem is intensifying and inequities between rich and poor countries are growing., a yearly assessment of health risks from climate, found that children and people 65 and older have seen a steady increase in exposure to heat waves over the last decade.
People rest at the Oregon Convention Center cooling station in Portland, Ore., on June 28, 2021, as a heatwave moves over much of the United States.Temperatures, though, remain just one concern. Humidity, sun exposure and wind also affect the body. High humidity, for example, can reduce the body’s ability to cool itself with sweat.
To understand trends in heat impacts, authors of the PNAS study estimated wet-bulb globe temperatures and heat index measures for thousands of cities using satellite thermal imaging data and combining them with readings on the ground. Then, they compared temperature data to population maps to understand how many people were affected by extreme heat.
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