Sinking Nations, Unsettled Law: Kiribati and Tuvalu Fight for Statehood After the Waterline

The I-Kiribati word for their home islands is "Tungaru." It translates, with a compactness that English cannot replicate, as something like "the long coral reef that runs east to west." The definition is geological, not merely geographical — these are atolls, not continental shelves, and their relationship to sea level is not a metaphor. The highest point of South Tarawa, the capital atoll, is roughly three metres above mean high water. The Intergovernmental Panel on Climate Change's Sixth Assessment Report projects a median sea level rise of 0.44 metres under an intermediate emissions scenario and 0.77 metres under a high scenario by 2100, with non-linear contributions from Antarctic ice dynamics that could push the upper bound significantly higher. For Kiribati and Tuvalu, these are not modelling parameters. They are existential coordinates.

What happens to international law — to statehood, sovereign rights, treaty obligations, exclusive economic zones — when the physical territory of a state disappears beneath the ocean? The question has no settled legal answer. But Kiribati and Tuvalu are not waiting for the International Law Commission to provide one. They are making politics, not just policy, and the decisions they make in the next decade will set precedents that climate-vulnerable states from Bangladesh to the Maldives will live inside.

The Statehood Problem

Under the 1933 Montevideo Convention, a state requires a permanent population, a defined territory, a government, and the capacity to enter into relations with other states. The "defined territory" requirement is the legal tripwire for disappearing island states. If atolls become submerged or uninhabitable — not fully submerged, but salt-inundated to the point that agriculture and fresh water access collapse — the Montevideo criteria begin to fracture.

Kiribati's President Taneti Maamau has pursued a strategy of preventive assertion: arguing in multilateral forums that Kiribati's statehood and its Exclusive Economic Zone are legally continuous with its existing maritime boundaries regardless of future physical changes to its land territory. The Kiribati government backed this position with a 2023 proclamation declaring that its EEZ — encompassing some 3.5 million square kilometres of the Pacific, among the largest in the world — is a permanent sovereign feature not contingent on the habitability of its atolls. The legal argument draws on the UN Convention on the Law of the Sea's provisions for archipelagic states and on emerging scholarship from Teresia Teaiwa and others in Pacific legal studies.

Tuvalu has taken a parallel but distinct path. The 2023 Falepili Union treaty with Australia offers Tuvaluans a pathway to Australian residency and provides for Australian consultation rights over Tuvalu's foreign security arrangements — in exchange, partly, for Australian financial support for adaptation and, implicitly, for managed migration. Prime Minister Feleti Teo has framed the treaty as a model of Pacific-Australian partnership. Critics, including several Forum members, have characterised it as a sovereignty trade: statehood-in-name for a migration guarantee whose terms are set in Canberra.

The EEZ as the Real Prize

Whatever happens to the atolls, the economic geography of the issue centres on the EEZ. Kiribati's maritime zone includes some of the world's most productive tuna fishing grounds, managed through the Parties to the Nauru Agreement — a grouping of eight Pacific states whose collective licensing revenue funds a significant portion of their national budgets. Tuvalu's EEZ, though smaller, sits above potential deep-sea mineral deposits and contains strategic positioning in the central Pacific.

If Kiribati asserts — and the international community accepts — that its EEZ persists even if its land territory becomes uninhabitable, the state continues to exist in a meaningful economic sense even if its people are dispersed. Joeli Veitayaki, whose ocean governance research at the University of the South Pacific has examined this problem extensively, argues that Pacific small island states have historically governed vast maritime territories with minimal land surface, and that the legal architecture of UNCLOS was designed with this spatial reality in mind. The doctrine that would strip a state of its EEZ on losing its terrestrial territory was not what the Convention's framers intended — and the political costs of applying that doctrine would fall overwhelmingly on states with the smallest emissions footprint.

The Emissions Injustice Frame

Kiribati has contributed approximately 0.6 percent of cumulative global greenhouse gas emissions. Australia has contributed approximately 1.5 percent — more than double, from a population that is thirty times larger. The United States has contributed approximately 25 percent of historical cumulative emissions. Under any reasonably constructed framework of climate justice, the burden of adaptation and managed displacement should fall not on the I-Kiribati and Tuvaluan peoples but on the major historical emitters.

The political reality is the inverse. Australia's climate policy — as detailed in the Guardian's April 2026 reporting on rising coalmine emissions under the Albanese government's Safeguard Mechanism — continues to allow carbon offset purchases as a substitute for direct emissions cuts, meaning that Australian coalmines are increasing their absolute emissions while the country meets headline targets on paper. The cognitive dissonance between this domestic policy posture and Australia's role as the primary security and migration partner for drowning Pacific states is not lost on Pacific leaders. Greg Fry has described this as "the security-climate contradiction" at the heart of Australian Pacific engagement — Canberra offers security guarantees while declining to make the emissions cuts that are the only meaningful form of climate security for atoll states.

What Adaptation Actually Looks Like

Beyond the legal and diplomatic dimensions, the on-the-ground reality of climate adaptation in Kiribati and Tuvalu is a story of incremental but accelerating crisis. Fresh water lens contamination from saltwater intrusion has already forced relocation of communities on several outer atolls in Kiribati. Storm surge frequency is increasing. The Kiribati government has purchased 6,000 acres of land in Fiji — the "land of fish and land" strategy articulated by former President Anote Tong — as a potential relocation site, though Fijian political consent for a sovereign Kiribati territorial presence in Fiji remains unresolved.

In Tuvalu, the "Rising Nation" land reclamation project — building artificial land extensions on the Funafuti atoll using dredged coral and sand — has proceeded with New Zealand and Australian funding but has attracted criticism from marine biologists who note that the construction damages the reef ecosystems that provide the storm surge protection the reclamation is meant to make unnecessary. Francis Hezel's Micronesian scholarship on community resilience under colonial and environmental pressure suggests that the people of these islands have absorbed external disruptions before — but the rate and scale of climate change is categorically different from any previous disruption, and the adaptive capacity of communities under existential pressure has limits that outside observers consistently underestimate.

Mainstream climate coverage frames Kiribati and Tuvalu as victims. Monexus frames them as political actors — sophisticated, divided, and making genuinely difficult sovereignty calculations in the absence of adequate international support.