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🗞️ Driving the news: A groundbreaking study published in Nature has for the first time directly linked worsening global heat waves to emissions from individual fossil fuel and cement companies, known as “carbon majors”
• Analyzing 213 major heat waves between 2000 and 2023, researchers found that as many as 25% would have been virtually impossible without emissions from just 14 of the largest producers, including ExxonMobil and Chevron
• The study concludes these companies are responsible for half of the rise in heat wave intensity over the past century
🔭 The context: Event attribution science has previously shown how climate change amplifies extreme weather, and other studies have traced overall emissions to specific companies
• This research combines those strands, providing a quantified causal chain from corporate emissions to deadly climate impacts
• It estimates that the top 14 carbon majors alone raised global median heat wave intensity between 2010 and 2019 by nearly 0.5°C
• The work arrives as climate litigation against fossil fuel firms accelerates worldwide
🌍 Why it matters for the planet: By connecting extreme weather directly to the emissions of specific companies, the study strengthens legal and moral arguments for accountability
• It may bolster lawsuits seeking damages for climate-related harms, helping communities recover costs from deadly heat waves
• More broadly, it highlights how corporate responsibility extends across the full fossil fuel value chain — from extraction to combustion — underscoring the urgency of a transition away from carbon-intensive energy
⏭️ What's next: The findings are expected to be cited in climate liability cases in the U.S. and abroad, where courts have increasingly demanded stronger scientific evidence
• Researchers plan to expand the methodology to floods, wildfires, and other extreme events
• Policymakers and legal experts are likely to debate whether and how responsibility can be apportioned among major emitters, potentially reshaping the landscape of climate accountability
💬 One quote: “Courts are indicating a willingness to hold carbon majors accountable, but at the same time asking for more scientific certainty, and our study helps to close a part of that gap.” – Corina Heri, law professor and study coauthor
📈 One stat: Between 2010 and 2019, climate change raised the median intensity of heat waves by 1.68°C, of which 0.47°C came from the top 14 carbon majors alone
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