New Research Strengthens the Link Between Warming and Extreme Weather
A growing body of research links human-caused climate change to an increase in the likelihood and severity of extreme weather. Carbon Brief has mapped more than 900 studies connecting climate influence to nearly 1,000 events and trends, while recent NASA and World Weather Attribution analyses identify rising temperatures as a major factor in intensifying droughts, floods and mountain slope collapse.
Why It Matters
The compilation of studies and recent satellite and attribution analyses strengthen scientific evidence that warming is already affecting extreme weather, which has implications for disaster risk, recovery costs and international climate finance discussions tied to attribution findings.
Key Facts
- First major attribution study: 2004 study linked human-driven climate change to the 2003 European heatwave, which killed over 70,000 people
- Carbon Brief mapping: Mapped over 900 studies covering almost 1,000 extreme weather events and trends
- Attribution share reported: Carbon Brief: 77% of cases were made more likely or more severe; 8% were made less likely or less severe; overall 85% likely influenced by human-caused climate change
- NASA GRACE findings (2025): NASA found droughts and floods in the previous five years were more frequent, longer-lasting and more intense; 2024 figures were twice the 2003–2020 average
- Global temperature (2025): Average global surface temperature ~1.44°C above 1850–1900 preindustrial average in 2025 according to the source text.
Researchers and meta-analyses over the past two decades have increasingly linked human-caused warming to extreme weather. One of the earliest event-specific attribution studies, published in 2004, concluded that human influence had at least doubled the likelihood of the 2003 European summer heatwave, which resulted in more than 70,000 deaths across the continent. That finding spurred wider application of attribution science to other extreme events. UK-based Carbon Brief has compiled and mapped more than 900 published studies examining how climate change affected almost 1,000 individual extreme weather events and trends. According to Carbon Brief’s tally, 77% of the cases studied were made more likely or more severe by climate change; about 8% were assessed as less likely or less severe. Taken together, the organisation reports that roughly 85% of the mapped events and trends were probably influenced by human-caused warming. Independent satellite and attribution work has added fresh evidence. A 2025 analysis using NASA’s GRACE satellite data reported a sharp increase in the intensity of droughts and floods over the previous five years, noting that 2024 values reached about twice the 2003–2020 average. NASA researchers described the pattern as consistent with climate change being the most likely driver, while stressing that a longer observational record would be needed to confirm a sustained trend. Event-level attribution studies have also connected warming to specific disasters. A World Weather Attribution report involving around two dozen scientists found that industrial emissions likely played a key role in destabilising permafrost and ice in the Himalayas before a rock collapse in August that triggered deadly floods in Nepal and Tibet. The report’s authors noted other contributing factors, including prior seismic activity, but described a “very strong linkage” between higher temperatures and slope destabilisation. Nepal estimated recovery and rebuilding costs near $5 billion after the disaster, which killed more than 1,300 people with thousands still missing.
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