Future Extreme Weather Could Be Far Worse Than History Suggests, Study Warns

Scientists at King's College London warn that historical records of the deadliest storms and heat waves are a poor guide to how catastrophic future weather disasters could be, because current planning tools are not designed to identify worst-case outcomes such as higher death tolls and impacts on infrastructure and health.

In a perspective paper published in Nature Sustainability, researchers analyzed deaths from every recorded tropical cyclone and extreme heat event between 2000 and 2025, finding that a small number of catastrophic events accounted for most of the toll. Cyclone Nargis killed almost 140,000 people in Myanmar in 2008, more than twice as many deaths as the other 675 deadly tropical cyclones of the period combined. The deadliest heat wave struck Europe in 2003, killing around 70,000 people, almost half of them within the first two weeks of August.

The analysis suggested it was difficult to rule out future events with death tolls in the millions, though the authors stressed that this being possible does not mean it is likely. Lead author Dr. Tom Matthews, senior lecturer in environmental geography at King's College London, said: "History is almost guaranteed to make us underestimate future risk. The events that have shaped our sense of what extreme weather can do are not the worst that can happen."

Current risk-assessment approaches are generally good at anticipating familiar hazards of unfamiliar intensity, such as hurricanes with higher wind speeds, but not at preparing for events without precedent — for example, a severe heat wave striking just before a powerful hurricane, with millions evacuating and no access to air conditioning.

To help prevent such catastrophic scenarios, the authors set three priorities: horizon scans led by diverse experts, including existential risk scholars, frontline communities, insurers, climate fiction writers and climate modelers; better understanding of the thresholds beyond which impacts grow steeply; and mapping the physical limits of weather in climates far hotter and colder than today's.