‘Bigger than we thought it was going to be’—the ICJ Advisory Opinion clarifies states’ legal obligations relating to climate change
Environment analysis: On 24 July 2025, the International Court of Justice (ICJ) handed down its first advisory opinion (AO) on climate change. The AO has been widely heralded as a turning point in both international environmental law and in climate change litigation, transforming climate ambition into enforceable legal obligations and setting the stage for heightened scrutiny of both state and corporate conduct. Written by Estelle Dehon KC, of Corner Stone Barristers.