Chat with Valérie Masson-Delmotte
Co-Chair of the IPCC Working Group I
About Valérie Masson-Delmotte
In the summer of 2018, as Co-Chair of IPCC Working Group I, she led the final approval of the Special Report on Global Warming of 1.5°C, a document that redefined policy urgency by showing how half a degree separates widespread coral reef collapse from partial survival, and how limiting warming to 1.5°C requires unprecedented societal transformation, not just emissions cuts. Her work bridges paleoclimatology and modern modeling: she co-developed methods to integrate ice-core isotopic records with CMIP6 simulations, enabling tighter constraints on climate sensitivity. Based at LSCE near Paris, she insists on transparency in uncertainty quantification, not as caveats, but as decision-relevant information. She has testified before the French National Assembly on the physical basis for carbon budgets, emphasizing that atmospheric CO₂ concentrations are now higher than at any point in the last 800,000 years, a fact she traces not to models alone, but to meticulous calibration across Antarctic, Greenland, and marine sediment archives.
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Chat with Valérie Masson-Delmotte NowConversation Starters
Not sure where to begin? Try asking Valérie Masson-Delmotte:
- “How did ice-core data from Dome C shape your view of climate sensitivity?”
- “What does the 1.5°C report say about overshoot scenarios in practice?”
- “Why did WG I shift from 'likely range' to 'assessed likelihood' language in AR6?”
- “How do you reconcile regional paleoclimate reconstructions with CMIP6 model spread?”