Extreme temperature events pose rising global health risks

New research highlights the escalating health risks posed by extreme heat and cold as global temperatures rise. A study published in Nature Communications, tracking over 285,000 adults in Finland and the UK, found that individuals facing both chronic disease and socioeconomic disadvantages experienced more than tenfold higher excess mortality during extreme temperature events compared to those with fewer vulnerabilities.

In a separate study published in npj Clean Air, researchers examined how a warmer world might alter air quality. While warmer conditions could potentially reduce certain pollutants like ozone and fine particulate matter in some regions, the study warns that these benefits may be offset by the increased severity and duration of heatwaves. If heatwaves become more intense, deaths linked to extreme heat could rise more significantly than any reductions in pollution-related deaths.

Additionally, historical research in South Africa indicates that human perception of heatwave thresholds has remained statistically unchanged over the last century. As climate change shifts mean annual temperatures higher, more days will exceed these perceived thresholds, increasing human vulnerability to thermal stress.