The top United Nations court will take up the largest case in its history on Monday. It opens two weeks of hearings into what countries worldwide are legally required to do to combat climate change and help vulnerable nations fight its devastating impact.

A landmark case that began in a Pacific classroom and could change the course of future climate talks is about to be heard in the International Court of Justice.

Small nations that say they're devastated by an environmental crisis they haven't caused are hoping an opinion from the International Court of Justice will force the global community to act.

The world's top court will next week start unprecedented hearings aimed at finding a "legal blueprint" for how countries should protect the environment from damaging greenhouse gases—and what the consequences are if they do not.