Post-Paris Emissions Found to Intensify European Heat Waves, Stanford Study Says
A Stanford University study published in Geophysical Research Letters used a generative AI model to compare European heat waves under different emissions scenarios. It concluded with more than 99% probability that human-caused emissions since the 2015 Paris Agreement have made recent European heat waves more intense. The authors said adaptation will be needed as extreme heat is expected to worsen, even with future emissions reductions.
Stanford researchers trained a generative AI model to compare European heat waves under different emission scenarios. Their Geophysical Research Letters paper found over 99% probability that emissions since the 2015 Paris Agreement strengthened recent European heat waves. Lead author Jared Trok said summer 2025 and each year’s hottest week since at least 2021 likely would have been cooler without those emissions.
The study notes nearly one-fifth of fossil-fuel carbon dioxide has been released since Paris. Almost 200 countries pledged there to pursue a 1.5°C limit compared with pre-industrial conditions. Co-author Noah Diffenbaugh said future emissions are expected even under optimistic reduction timelines, so extreme heat likely will worsen further.
The findings may influence how European governments, city planners, health services, and employers prepare for heat. Older adults, outdoor workers, and people with limited cooling access could face greater risks during hotter spells. Insurance and infrastructure planning may also shift as repeated extremes raise costs and disruption. Because the study points to worsening heat even with future cuts, adaptation discussions could gain urgency alongside mitigation.