Pakistan, May 31 -- WASHINGTON - Nearly half the global population experienced at least 30 extra days of extreme heat over the past year due to human-driven climate change, according to a new study. The report, released ahead of global Heat Action Day on June 2, highlights the urgent health risks posed by rising temperatures.

Researchers from World Weather Attribution, Climate Central, and the Red Cross Red Crescent Climate Centre analysed the period between May 1, 2024, and May 1, 2025. They found that about four billion people-49% of the world's population-endured significantly more extreme heat than in a world without global warming.

The study defined "extreme heat days" as those hotter than 90% of temperatures recorded between 1991 ...