The United Nations' highest court will deliver an opinion on Wednesday that is likely to determine the course of future climate action across the world. Known as an advisory opinion, the deliberation of the 15 judges of the International Court of Justice in The Hague is legally non-binding.

The United Nations' highest court will deliver an opinion on Wednesday that is likely to determine the course of future climate action across the world.

“The advisory opinion is probably the most consequential in the history of the court because it clarifies international law obligations to avoid catastrophic harm that would imperil the survival of h...