Global Study Warns of Sharp Rise in Extreme Heat Days Over the Past Three Decades

Global Study Warns of Sharp Rise in Extreme Heat Days Over the Past Three Decades
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A new international study has revealed a troubling increase in the number of extremely hot days worldwide over the past three decades, raising growing environmental and public health concerns.

The study, conducted by Australian scientists in collaboration with researchers from 18 countries, was published in the Annual Review on Environment and Resources. It found that the global average number of extremely hot days per year rose from 12 between 1990 and 2006 to 19.3 between 2007 and 2023 — a nearly 60% increase.

The most significant increases were recorded in Africa, the Middle East, and parts of Asia, where extreme heatwaves have become more frequent and pose risks beyond heatstroke, including cardiovascular illnesses, mental health issues, and complications for pregnant women.

Notably, the study employed a comprehensive new methodology that considers multiple climate variables — including air temperature, humidity, solar radiation intensity, and wind speed and direction — to provide a more accurate assessment of heat-related risks.

In light of these findings, the researchers called for a coordinated global response. They urged countries to enhance data-sharing, develop national adaptation strategies, raise public awareness, and involve local communities in mitigation efforts. Individual action, they added, is also crucial in the face of intensifying climate-related threats.