How do scientists prove a specific storm was human-caused?

Nature · Published 25 October 2026 Swipe more like this →

In short: Linking a single flood or heatwave to human activity sounds like guesswork, but it is a rigorous field of science. By combining historical records with complex simulations, researchers can now determine if our carbon emissions made a specific weather event more likely or more severe.

This field is known as attribution science. Researchers aim to determine if climate impacts from humanity increased the frequency or intensity of severe weather occurrences. To do this, scientists examine historical records—some dating back to the 1800s or 1950s—to establish a baseline for the frequency and intensity of past weather. They then use climate models, which are sophisticated simulations, to see how the number or strength of these events changes as greenhouse gases increase.

The results of these studies vary depending on the type of weather. For example, almost all studies on extreme heat events indicate a clear human influence. Drought studies are more divided, with about half showing significant human impact. Extreme rainfall is a growing area of study where a smaller but increasing number of cases detect a human signal. Tropical storms present a complex picture: while rising sea temperatures increase storm intensity and sea levels increase coastal flooding risks, the global total number of tropical cyclones may actually decrease.

These findings matter because extreme weather is no longer just a natural variability; it is a growing health and infrastructure risk. In the WHO European Region alone, extreme heat claimed more than 60,000 lives in 2022. Without adaptation, river flooding in that same region could affect up to 400,000 additional people annually by the 2080s. By identifying the physical mechanisms—such as rising atmospheric moisture and warming oceans—scientists help societies build resilience against a warming planet.

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