The World Court's previous advisory opinions have been instrumental in establishing international laws, such as the right to self-determination, prevention of genocide and nuclear disarmament.
In a statement, Vanuatu said current levels of action and support for vulnerable developing countries are insufficient.
It said it wants the ICJ to clarify the responsibilities for climate change under international law.
Although not binding, a climate change ICJ advisory opinion would add great legal weight to the increasing amount of climate litigation happening globally.