Climate change is fueling a physical inactivity crisis

Warming temperatures from climate change will likely lead to high levels of physical inactivity in the future, which could have significant public health implications. Heat leads to dehydration, exhaustion and overall inhospitable conditions. Regions with less air conditioning and cooling facilities will see the highest reduction in activity, but without intervention, more places will be affected.

Running hot

Rising temperatures are “projected to increase the prevalence of physical inactivity, translating into additional premature deaths and productivity losses,” said a study published in The Lancet Global Health. The study analyzed data from 156 countries between 2000 and 2022 to create a model for future physical activity globally. The results showed that by 2050 “each additional month with an average temperature above 27.8°C (82°F) would increase physical inactivity by 1.5 percentage points globally and by 1.85 percentage points in low- and middle-income countries,” said a release about the study.

With this reduction in physical activity, there would be a “predicted 0.47-0.70 million additional premature deaths annually and $2.40-3.68 billion in productivity losses,” said the release. The effects were mostly concentrated in low- and middle-income countries, and “some hot spot countries closer to the equator show estimated increases in physical inactivity of more than 4 percentage points by 2050,” said The Washington Post. On the other hand, high-income countries had no discernible difference in physical activity levels because they tend to have better infrastructure to combat heat.

The inactivity levels would increase gradually. The “real-world picture is usually not that people suddenly stop moving altogether,” the study’s lead author Christian Garcia-Witulski, a research fellow at the Lancet Countdown Latin America and a professor at the Pontifical Catholic University of Argentina, said to the Post. Instead, “heat gradually erodes the safe, comfortable and practical opportunities people have to stay active in everyday life.” Warmer temperatures would hinder activities such as “jogging outdoors or walking to work, particularly in areas which don’t have strong adaptive measures like proper shading or cool pavements,” said Time.

Internal conflict

Even without the climate pressure, “nearly one third (31%) of the world’s adult population, 1.8 billion adults, are physically inactive,” said the World Health Organization (WHO). Between 2010 and 2022, the number of people who “do not meet the global recommendations of at least 150 minutes of moderate-intensity physical activity per week” increased by 5%. Climate change is only expected to increase the number further. While lower-income countries face the brunt of the decrease in physical activity, “the pattern was not uniform,” and “some colder areas, such as North America, Argentina and South Africa, also report high rates of physical inactivity,” said the study.

“Outdoor laborers, street vendors and subsistence farmers cannot easily shift physical exertion to cooler hours,” said the study. Also, “women and adolescents often lack access to climate-controlled recreational spaces.” Physical activity “contributes to prevention and management of noncommunicable diseases such as cardiovascular diseases, cancer and diabetes and reduces symptoms of depression and anxiety,” said WHO.

“The link between physical inactivity and chronic diseases is so strong that any compromise to achieving regular exercise” will “pose broad public health risks,” Jonathan Patz, the chair of health and the environment at the University of Wisconsin-Madison, said to the Post. Prioritizing reducing greenhouse gas emissions as well as building cooling infrastructure will be necessary for human health.