UN warns 2.4B workers face daily heat risk, urges action

A joint United Nations health and climate agencies report warns that the world is entering a new era in which extreme heat is a daily risk for workers across nearly every sector. The study estimates that about 2.4 billion workers are exposed to excessive heat, representing roughly seven in ten of the global workforce, and says heat-related illness, dehydration and kidney and cardiovascular problems are mounting as heatwaves become more frequent and intense. It also finds that productivity declines as temperatures rise, with a standard deterioration of roughly two to three per cent for every degree Celsius above 20C. The researchers urge governments, employers and workers to act now with tailored heat-action plans that address regional conditions, industry needs and vulnerable populations.

Health and economic consequences are central to the report’s argument. Heat stress not only poses acute dangers such as heat stroke and dehydration, but can also lead to longer-term health issues and reduced capacity to work safely. In addition to direct health impacts, the analysis links rising temperatures to more workplace accidents and lower output, noting that even small productivity...