Ralph Regenvanu, Vanuatu’s minister for climate change, has played a pivotal role in elevating his country’s advocacy for climate justice to the international legal arena. Under his leadership, the Pacific island nation became a prominent force in pressing for legal accountability on climate action, culminating in a significant ruling by the International Court of Justice (ICJ).

In December 2024, Regenvanu personally presented Vanuatu’s case before the ICJ in The Hague, urging the court to issue an advisory opinion on the legal obligations of states to address climate change. He emphasized that the climate crisis posed an existential threat to the people of Vanuatu and argued that countries’ responsibilities extended beyond moral considerations to binding legal duties.

The ICJ delivered its advisory opinion in July 2025, marking a landmark moment in international climate law. The court affirmed that states have international legal obligations to protect the climate system and warned that failure to uphold these duties could result in legal consequences. This ruling is viewed as a critical development in framing climate change as a matter of law rather than solely policy or ethics.

Following the ruling, Vanuatu, with Regenvanu at the forefront, has sought to translate the court’s findings into concrete political action. Regenvanu has been actively promoting a new resolution at the United Nations aimed at giving practical effect to the ICJ’s opinion. Additionally, he has endorsed the Fossil Fuel Non-Proliferation Treaty, advocating for a structured global phase-out of coal, oil, and gas to mitigate further environmental damage.

Regenvanu’s efforts highlight the increasing use of legal mechanisms to advance climate justice, positioning Vanuatu—one of the nations most vulnerable to climate change—as a key player in the global movement seeking accountability and accelerated action from the international community.