PORT VILA—Last year, the International Court of Justice (ICJ) delivered a legal opinion on climate change with a clarity of purpose not seen since the 2015 Paris agreement. It left no doubt that states have a legal obligation to prevent significant harm to the climate system, and that failure to do so carries legal consequences.

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My own country, Vanuatu, brought this question to the world and to the ICJ. But we were not alone. We built a coalition of countries spanning every region and gained sustained support from youth movements. Ultimately, 132 countries co-sponsored a motion for a United Nations resolution asking the ICJ to rule on the matter, which then passed by consensus. It was a historic moment, and one that did not happen by accident.

Now we are back at the UN General Assembly, presenting a resolution to give the ICJ’s advisory opinion practical effect and calling on the world to support it. It is normal practice for ICJ advisory opinions to go back to the........

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