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Exceptional interview with Valérie Masson Delmotte, former chair of IPCC Group 1. Megafires, year-round heatwaves or devastating floods: natural disasters are multiplying while global warming is only 1.1°C above pre-industrial temperatures. Hence this question: from 2°C, is the climate at risk of getting out of control? To answer this question, we welcome Valérie Masson Delmotte, paleoclimatologist, researcher at the CEA and IPSL, co-chair of IPCC working group 1 devoted to the physical bases of climate change between 2015 and 2023 and member of the High Council for Climate Interview: Maxime Thuillez CHAPTERS: 00:00 Introduction 00:50 The IPCC scenarios (SSP) 03:35 Levels of warming 07:53 The Paris Agreement 10:43 +2°C: a climate out of control? 16:45 What does a world at +2°C look like? 22:55 Uninhabitable regions? 28:01 The disappearance of deltas? 34:47 The flow of rivers 45:45 Tipping points 50:58 The surprises of climate change 53:30 The experience of the IPCC mandate