ISTANBUL: Human-driven climate change added an average of 30 extra days of extreme heat over the past year for nearly half of the world’s population, according to a new report released Friday ahead of Heat Action Day on June 2.
The study, conducted by scientists from World Weather Attribution (WWA), Climate Central, and the Red Cross Red Crescent Climate Centre, emphasises the growing risks posed by heat waves as global fossil fuel use continues, Anadolu Ajansi (AA) reported.
Between May 2024 and May 2025, some four billion people, about half of the global population, faced at least 30 additional days of extreme heat, defined as temperatures hotter than 90 per cent of historical observations for their regions, compared to a world without climate change.
The researchers also found that climate change increased the number of extreme heat days by at least twofold in 195 countries and territories. All 67 major heat events recorded in the last year were exacerbated by human-caused climate change.
“This study needs to be taken as another stark warning. Climate change is here, and it kills,“ said Friederike Otto, co-lead of WWA and senior lecturer at Imperial College London.
“We know exactly how to stop heat waves from getting worse: restructure our energy systems to be more efficient and based on renewables, not fossil fuels.”
Mariam Zachariah, a researcher at Imperial College London, described the results as “staggering,“ noting that frequent, intense heat spells are linked to widespread impacts, including heat illnesses, deaths, crop losses, lowered productivity, and transport disruptions.
Roop Singh, head of Urban and Attribution at the Red Cross Red Crescent Climate Centre, emphasised the urgent need to scale up responses.
“We need better early warning systems, heat action plans, and long-term urban planning to meet the rising challenge,“ Singh said.
Vice President for Science at Climate Central Kristina Dahl stressed that heat is the deadliest consequence of climate change.
“There is no place on Earth untouched by climate change, and we have the science to quantify how fossil fuel emissions are reshaping our daily temperatures and putting billions at risk,“ she said.
The report calls for governments to strengthen heat action plans, increase monitoring and reporting of heat impacts, and prioritise long-term adaptation strategies.
