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Back in 2015, the nations of the world made a formal commitment to keep global warming below 2 degrees centigrade. So much for fine words: global greenhouse gas emissions are still rising. The data suggest the planet is warming at an alarming rate. What to do about it? Stephen Sackur interviews Roger Hallam, the co-founder of Extinction Rebellion, a movement dedicated to mass resistance and civil disobedience: how far are these climate rebels prepared to go?