In 2025, the International Court of Justice (ICJ) will deliver an advisory opinion on the legal obligations of nations with respect to the mounting damage caused by climate change. This ruling will definitively restate applicable international law, provide a basis for new global policy decisions within the U.N. General Assembly, and provide a predicate for new lawsuits in national courts. To be effective, remedies for breaching a government’s duties to avert climate change will require a “collective remedy,” not merely financial compensation. This ruling was sought by law students from the South Pacific and elsewhere; this Article, also by young legal scholars, evaluates the scope and estimates the content of the forthcoming ICJ opinion.