A massive “super El Niño” could kill as many as 451,000 people worldwide over the next several months, according to a new report from University of Chicago researchers.
Story Snapshot
- The University of Chicago’s Climate Impact Lab projects 451,000 excess heat deaths worldwide from June 2026 to February 2027.
- Poorer, hotter nations with weak cooling and health care systems face the highest death tolls.
- The report says 239,000 of those deaths could happen in just the next six months.
- Researchers point to a naturally occurring El Niño pattern layered on top of long-term global warming.
- The study calls for cooling centers, hydration stations, and worker protections to cut the death toll.
Report Projects Massive Global Death Toll
Researchers at the University of Chicago’s Climate Impact Lab released a report on September 23, 2026, titled “451,000 at Risk.” The authors, Michael Greenstone, Tamma Carleton, Genevieve Maricle, and Emily Grover-Kopec, say this year’s “Super El Niño” will drive heat deaths far above a normal year. The report states plainly that 451,000 lives will be lost to heat during the first nine months of this El Niño compared to a typical year.
Reuters independently confirmed the figure the same day, reporting that extreme heat from the “super-El Niño” could cause up to 451,000 excess deaths across the globe between June 2026 and February 2027. The report breaks the number down further, stating that 239,000 of those deaths, give or take 11,000, could happen in just the next six months alone.
Poorer Nations Bear the Heaviest Burden
The researchers built their projection using seasonal weather forecasts combined with local mortality data from more than 24,000 regions around the world. That gives the report a broad data foundation, even though the final number remains a model-based projection rather than a confirmed death count. The heaviest losses are expected in countries with weak access to cooling, clean water, and health care.
Hotter, poorer nations face the greatest risk because they lack the infrastructure wealthier countries use to protect people during extreme heat, according to the report’s findings. Multiple outlets covering the release named countries such as Nigeria, Indonesia, Sudan, and India as facing especially high tolls, underscoring how the burden of this crisis falls disproportionately on the developing world rather than industrialized nations like the United States.
Natural Climate Pattern Fuels the Crisis
El Niño is a naturally occurring climate pattern that periodically warms ocean waters and shifts weather worldwide, and this year’s version is being described as unusually strong. Researcher Michael Greenstone put the human toll behind the statistics in plain terms, telling The Guardian, “The estimate of 451,000 people is such a large number that it can be numbing, but it is made up of parents and children, grandparents and neighbours, people going to work, caring for families, and living their lives”.
Coverage of the report emphasized that El Niño’s natural heat spike is happening on top of longer-term warming trends, a distinction that matters for anyone trying to understand what is driving the numbers. The report itself does not claim every death is caused by human activity alone, instead framing the crisis as heat piling on top of an already-warm baseline during a naturally recurring weather event.
Researchers Push Prevention Over Panic
The report does not stop at doom and gloom. It argues that targeted, practical steps can meaningfully cut the death toll before it happens. Recommended measures include cooling centers, hydration stations, protections for outdoor workers, and expanded emergency health care capacity in the hardest-hit regions. That framing suggests the researchers see this as a call to action rather than an unavoidable outcome.
The projection covers a future window that has not yet fully played out, meaning the real-world death count will not be confirmed until after February 2027. Even so, the report’s authors and multiple independent news organizations reported the same figures consistently, giving policymakers a clear, unified warning to act on now rather than after the fact.
Sources:
youtube.com, climate.uchicago.edu, impactlab.org, fox13now.com
