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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.

In the study, an “extreme heat day” was characterized as one where the temperature exceeded what had been observed during 90% of the period from 1991 to 2020. By employing climate models, scientists contrasted present conditions with scenarios devoid of anthropogenic emissions and discovered definitive proof connecting each of the 67 significant heat occurrences over the previous year to global warming.

Aruba topped the list of affected regions, suffering 187 extreme heat days-45 more than expected without global warming. The findings come after 2024 was declared the hottest year on record, with temperatures even crossing the critical 1.5degC threshold set by the Paris climate agreement.

The writers emphasized the urgency of taking prompt measures, particularly in low-income nations where information about heat-induced health effects is scarce. They urged for an increase in early alert mechanisms, comprehensive heat response strategies, and awareness initiatives aimed at safeguarding susceptible groups.

Nevertheless, they cautioned that adaptation measures alone will not suffice. They emphasized that the sole long-term remedy is significantly decreasing our reliance on fossil fuels to halt temperature increases and safeguard coming generations from more severe heatwaves.

 
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