In this episode Dapo Akande, Marko Milanovic and Philippa Webb are joined by Philippe Sands and Margaretha Wewerinke-Singh. They reflect on the role and significance of advisory opinions by international courts, particularly in the context of various current efforts to litigate legal issues regarding climate change in such advisory proceedings in several different courts. They also discuss previous high-profile advisory proceedings before the ICJ, including the Nuclear Weapons, Wall and Kosovo cases, focusing on the different types of advisory cases, their legal and political purposes, the litigations strategies of the parties and the need to formulate questions tailored to the particular moment and the particular forum.