On May 20, the United Nations General Assembly is expected to vote on a resolution led by Vanuatu responding to the International Court of Justice’s landmark 2025 advisory opinion on climate change. The vote will not create new binding climate law overnight. But it could do something almost as important: help move climate responsibility from political promise to legal accountability.

The final text of the resolution seeks to give effect to the ICJ’s advisory opinion through coordinated global follow-up. It also reaffirms that international law, including human rights law, the law of the sea and customary international law, applies to state conduct on climate change.

That is why this vote matters.

For three decades, global climate politics has been dominated by voluntary pledges, delayed promises and carefully worded agreements that too often allow the largest emitters to move at the pace they find convenient.

Vanuatu is now asking a different question: what if climate action is not only a political choice, but a legal duty?

That question changes the battlefield. Politics can delay but law can create big consequences over time.

Vanuatu, home to just over 300,000 people, has contributed almost nothing to the climate crisis. Yet it is among the first nations on Earth being forced to confront what runaway warming actually means: stronger cyclones, rising seas, damaged homes, saltwater moving into freshwater, forced relocation and the unbearable possibility that entire cultures may be pushed away from the places that made them.

But Vanuatu is not only a victim of the climate crisis. It may also become one of the countries that changes the legal future of climate responsibility.

From A Classroom In Port Vila To The World’s Highest Court

The story began not in Washington, Brussels or Beijing, but with Pacific law students at the University of the South Pacific in Port Vila.

They asked a simple question: what if the world’s highest court clarified what states are legally required to do about climate change?

That question travelled from a classroom in Vanuatu to the International Court of Justice in The Hague. On July 23, 2025, the ICJ delivered its advisory opinion on the obligations of states in respect of climate change.

The Court’s opinion was not a direct order forcing governments to close coal mines the next morning. But it was historic.

Reuters reported that the Court said countries must act collectively against the “urgent and existential threat” of climate change, and that failure to meet climate obligations could expose states to legal action from countries suffering climate-related damage. The opinion also made clear that countries are responsible for regulating companies under their jurisdiction or control.

This is the foundation Vanuatu is now trying to build upon at the UN.

The May 20 resolution is not legally binding in itself. It reportedly does not create new legal obligations. But that is not the point. The point is that the world’s highest court has already stated that climate obligations exist under international law. A strong vote at the UN General Assembly would help move that legal reality from courtrooms into diplomacy, from theory into institutional follow-up, and from moral language into political pressure.

In other words, the vote does not make climate responsibility real. The ICJ has already done that.

The vote asks whether governments are willing to act as if it matters.

Why The Superpowers Are Worried

A small island state has forced the world’s superpowers and fossil fuel economies to negotiate over the legal consequences of climate harm. Even compromise language shows that Vanuatu has moved the fight onto terrain where the fossil fuel economy is uncomfortable.

If the resolution were meaningless, no one would care whether it passed.

And if Vanuatu wins the vote, even on compromise language, the consequences could be much larger than many people understand.

First, it could strengthen climate litigation around the world. Courts are already dealing with a growing wave of climate cases. A UN General Assembly resolution welcoming and helping operationalize the ICJ opinion would give judges, lawyers, vulnerable countries and civil society another tool to argue that governments must cut emissions, regulate polluting industries and prevent climate harm.

Second, it could make fossil fuel expansion legally riskier. The ICJ opinion strengthens the argument that states must regulate private actors under their jurisdiction or control. That matters because fossil fuel companies do not operate in a legal vacuum. They receive permits, subsidies, infrastructure, diplomatic support and political protection from states. If states have legal obligations to prevent significant climate harm, then continuing to enable fossil fuel expansion becomes harder to defend.

Third, it could shift the language of climate diplomacy.

For years, governments have spoken about ambition. Ambition sounds noble, but it is optional.

Obligation is different because it implies responsibility. Responsibility implies consequences.

Vanuatu is trying to move the world from climate ambition to climate accountability.

The legal counterpart to the political momentum

That shift is not happening in isolation. Just weeks before the upcoming UN vote, 57 countries gathered in Santa Marta, Colombia, for the first international conference focused specifically on transitioning away from fossil fuels. The meeting, co-hosted by Colombia and the Netherlands, brought together countries representing roughly half of the global economy and helped form a “coalition of the willing” for the clean energy transition. It did not produce binding commitments, but it showed something important: the countries prepared to move beyond promises are beginning to organize.

Vanuatu’s UN resolution can be seen as the legal counterpart to that political momentum. Santa Marta asked how countries can practically transition away from fossil fuels. Vanuatu is asking what happens when they refuse to act despite knowing the harm. One process builds the road forward. The other strengthens the legal case for why the journey cannot be optional.

The Human Reason This Matters

The legal debate is technical. The reason behind it is not.

In a powerful report for the Swedish science magazine Forskning & Framsteg, researcher and author Victor Galaz travelled to Vanuatu and Fiji to document what is already at stake. He reports from Port Vila, where Vanuatu is still recovering from a devastating 7.3 magnitude earthquake in late 2024, after being hit the previous year by two major tropical cyclones within just 48 hours. Galaz reports that 64% of the country’s GDP was wiped out during those hours.

In a country of just over 300,000 people, disasters of that scale are not only emergencies. They are national shocks.

This is what climate injustice looks like.

Those least responsible are hit first, those most responsible keep delaying, and those already facing the consequences are told to be patient.

But patience is a luxury that disappears when your land is disappearing. In the same report, Galaz interviews Vanuatu’s climate minister Ralph Regenvanu, who says climate change is his country’s national security issue and a question of survival. Regenvanu also makes clear that Vanuatu will not withdraw its UN resolution, despite pressure and despite painful compromises in the text.

That sentence should echo far beyond the Pacific.

For Vanuatu, climate change is national security.

Soon, it will be national security for everyone. Rising seas will not stop at island borders. Heat will not spare wealthy cities. Crop failures, water stress, infrastructure damage, insurance collapse and forced migration will not remain problems of the poor. Vanuatu is among the first to face the full force of this new reality, but it will not be the last.

The Pacific slogan has long been: “1.5 to stay alive.” For too long, many in the rich world heard it as a plea from distant islands. But it was never just a plea. It was a planetary warning.

This Is Also About Markets

For business leaders and investors, the May 20 vote should not be dismissed as symbolic diplomacy.

Legal risk is financial risk.

If the ICJ opinion gains further political backing through the UN system, the consequences will not be limited to government ministries. They could eventually affect infrastructure planning, energy investment, insurance, sovereign risk, corporate disclosure, litigation exposure and the cost of capital for high-emitting industries.

Of course, law alone will not decarbonize the global economy. Technology, investment, clean energy deployment, grid expansion, finance and political leadership will all matter. But law can change the risk landscape in which those decisions are made.

The fossil fuel economy has long relied on a convenient separation between climate science and legal liability. Science could warn. Diplomacy could negotiate. Markets could continue.

That separation is now weakening.

The law is beginning to catch up with the physics. No responsible boardroom should ignore that.

What Happens If Vanuatu Wins?

If the resolution passes with strong support, the immediate legal effect will still be limited. No new global climate police will appear. No international court will suddenly force every government to comply. The largest emitters may still try to ignore, dilute or delay the consequences.

But the signal would be significant.

A positive vote would say that the UN General Assembly recognizes the ICJ opinion as a foundation for action. It would strengthen vulnerable countries in future negotiations. It would help lawyers and campaigners push governments and courts to treat climate protection as a duty, not a favour. It would tell investors and fossil fuel companies that the legal risk around continued expansion is rising.

The consequences would not be immediate or automatic. They would accumulate through litigation, diplomacy, regulation, investment decisions and public pressure.

If the vote fails, or passes only with a very weak coalition, the message would be darker. It would show that even after the world’s highest court clarified the law, governments remain too captured by fossil fuel power and geopolitical fear to act.

But even then, Vanuatu’s campaign would not disappear.

The ICJ opinion would remain. The legal arguments would remain. The moral force would remain.

And the climate crisis would continue to make the case every year, every storm, every flood, every failed harvest.

Still, the most likely outcome appears to be a positive vote on a softened text. The original request for the ICJ opinion was adopted by consensus by the UN General Assembly in 2023 and had 132 co-sponsors, suggesting that the diplomatic foundation is broad. The final resolution may be less ambitious than Vanuatu wanted, but that may also make it harder for governments to oppose.

So perhaps the correct question is not whether Vanuatu can win everything on May 20.

It cannot.

The question is whether Vanuatu can win enough to move the world one step further from voluntary promises toward legal accountability.

And that, incredibly, may happen.

The Small Nation With The Strongest Case

This is a David and Goliath story, but not the simple version.

Vanuatu is not throwing a stone at one giant. It is challenging an entire global system built on the assumption that the biggest emitters can set the pace, write the rules and decide how much justice the vulnerable are allowed to ask for.

The superpowers may still have the money.
They may still have the oil.
They may still have the geopolitical weight.

But Vanuatu has something else.

It has the law, the science and the moral clarity of those fighting for survival.

And in the long run, that may be the strongest power of all.