What is COP26, why is it important, and what should we expect? With guest co-host Gideon Lichfield, the global editor in chief of Wired, we look at the key issues at the Glasgow climate summit where world leaders need to show how we can achieve net-zero greenhouse gas emissions and avert climate catastrophe. Includes an interview with veteran climate campaigner Jennifer Morgan, the Greenpeace chief who has been to every single COP.