President Donald Trump’s second term has been a nightmare for global cooperation on climate change. Trump has yanked the United States from the Paris climate agreement, attacked a global agreement on a carbon tax for cargo ships, and threatened countries with tariffs if they get too vocal about climate. This week brought a notable exception. World leaders at the United Nations General Assembly on Thursday approved a unanimous resolution on how to handle sea level rise, and the United States did not block it from moving forward. The passage of the accord represents a rare win for multilateralism, made all the more notable by the fact that the agreement includes references to climate change and climate aid for developing countries. The declaration could bring new momentum to efforts to help small island states, said Philip Davis, the prime minister of the Bahamas, in an interview with Grist. ‘Our landmass is less than 3 meters above sea level, we are already seeing our land being swallowed by water, and the global effort to stem the carbon footprint has stalled,’ he said. ‘I think this declaration will perhaps heighten the flow of action.’ For many low-lying countries, the implications of this agreement could be profound. Some island nations, like Tuvalu and the Marshall Islands, face almost total inundation over the next century as rising temperatures melt the world’s ice sheets and glaciers. It had never been clear what would happen to those sovereign nations. Under the agreement, those states will continue to exist as political actors even if their landmass disappears. They’ll also retain control over their old maritime borders, the stretch of sea extending from the coastline over which a country has exclusive control for fishing, energy development, and other military and economic activity. An aerial view of a strip of land between the Pacific Ocean and a lagoon in Funafuti, Tuvalu. The island nation of around 11,000 people is facing total inundation as sea levels rise. Mario Tama / Getty Images The declaration is the result of a campaign by the Alliance of Small Island States, an influential bloc of low-lying island nations. Recent rulings from international legal bodies have helped affirm countries’ continued rights in the face of sea level rise, but the world’s leaders had never endorsed those rulings. ‘What was long treated as a legal ‘presumption’ is now an affirmation,’ said Kamal Amakrane, the managing director of the Global Center for Climate Mobility and the climate envoy for Trinidad and Tobago, which helped initiate talks toward a global declaration. He noted that the world has agreed to preserve small islands ‘by consensus, in a year when consensus has been hard to come by.’ The document enshrines strong protections for states at risk of losing land. It holds that countries ‘can … maintain their maritime zones in the face of physical changes resulting from sea level rise,’ a principle that the document calls a ‘presumption in favor of continued statehood.’ That echoes a landmark climate ruling from the International Court of Justice last year, which held that ‘once a State is established, the disappearance of one of its constituent elements would not necessarily entail the loss of its statehood,’ and which affirmed that international law requires countries to respect one another’s established borders. The declaration will go a long way toward helping secure the future of small island states. For the Bahamas, protecting pristine ocean territory is essential to its tourism-driven economy. Davis said that the legal protections will safeguard his country and others against efforts to claim ocean territory for industries like deep-sea mining. ‘This cannot be a free-for-all,’ he said. ‘This cannot be might is right, and might takes what is there.’ The agreement also includes strong language recognizing that developed countries and historic emitters have an ‘urgent’ obligation to provide ‘expanded access’ to adaptation funds for small island states. This money could build seawalls or restore mangrove forests to protect coastlines from rising water, or it could help relocate populations from flood-prone areas. Prime Minister Philip Davis of the Bahamas addresses the United Nations General Assembly in September 2025. The Bahamas is seeking to protect its ocean territory from exploitation as its land disappears. Charly Triballeau / AFP via Getty Images The declaration on its own won’t do anything to increase the money available to states like the Marshall Islands. Wealthy countries are currently giving poor ones about $130 billion a year in grants and low-interest loans for clean energy and adaptation, well below the level that experts believe is necessary to avoid catastrophic impacts. The world agreed in 2024 to reach $300 billion in annual aid by 2035, but it’s too early to gauge progress toward that target. Even then, much of that finance is in the form of loans, which are hard for many island states to afford — the Bahamas has billions of dollars of debt already, much of it stemming from damages after 2019’s Hurricane Dorian. Even so, the mention of adaptation was welcome for island nations. Language about climate aid has been much contested at recent United Nations climate talks, with wealthy nations rejecting calls for trillions that could build flood walls and elevate sinking islands. Trump has gone further and rejected almost all international aid obligations, dismantling the U.S. Agency for International Development and pulling out of dozens of treaties. Yet neither the State Department nor other finance-averse countries rejected the language in the sea level rise declaration. (The State Department did not respond to a request for comment by publication.) The reason for the cooperation by the United States is that legal protections against sea level rise are in every country’s interest, said Bryce Rudyk, a law professor at New York University who also serves as a legal advisor to the Alliance of Small Island States. The United States and other rich nations could lose land to sea level rise, and in some countries a shifting maritime border might jeopardize sovereign control over natural resources like oil, minerals, or offshore wind. ‘Everyone will lose land, and no one wants to lose ocean territory,’ he said. ‘I think that’s why they were fine with making these relatively strong statements. … It’s in everyone’s interest to say, ‘We don’t want states just disappearing.’’ This story was originally published by Grist with the headline UN passes first declaration on sea level rise, protecting island nations’ sovereignty on Sep 24, 2026.