NEW YORK / RankWire.AI / – United Nations Secretary-General António Guterres issued a warning that the rapid increase in sea levels is elevating dangers for coastal populations and economies across the globe. He delivered this message during a high-level session of the UN General Assembly in New York on September 24. Guterres highlighted that approximately 770 million individuals reside less than five metres above the high-tide line. In 2024, the global average sea level rose by 5.9 millimetres, marking the highest annual increase ever recorded. The assembly’s focus was on the threats faced by low-lying nations, coastal urban centers, and vulnerable communities.
The World Meteorological Organization has documented a notable acceleration in the rate of global sea-level rise since the satellite era began. Data reveal that the yearly increase grew from 2.1 millimetres during 1993-2002 to 4.7 millimetres in 2015-2024. According to WMO, 2024 recorded the highest global mean sea level in the satellite record. Warming oceans cause seawater expansion, while melting glaciers and ice sheets contribute additional water to the seas. These processes heighten risks of coastal flooding, erosion, and saltwater intrusion.
Projections from the Intergovernmental Panel on Climate Change indicate further rises across all assessed emissions scenarios this century. Under a very low emissions pathway, the global mean sea level could increase between 0.28 to 0.55 metres by 2100. Conversely, a very high emissions scenario suggests a likely range of 0.63 to 1.01 metres. These estimates are based on the 1995-2014 average as the reference period. Guterres called on governments to reduce emissions and simultaneously strengthen measures to shield communities from climate-related impacts.
Global sea-level rise continues to accelerate
During the September 24 gathering, the General Assembly adopted a political declaration on sea-level rise through consensus. The declaration addresses issues related to science, financial support, resilience, international cooperation, and legal challenges associated with rising waters. It emphasizes the need for improved early-warning systems and more predictable funding for nations most at risk. General Assembly President Khalilur Rahman pointed out that the pace of global sea-level rise is quickening during the session. He also noted that ports handle over 80% of international merchandise trade, linking coastal hazards to global supply chains.
Special attention was given to small island developing states and low-lying coastal regions during the UN meeting. Rising seas threaten to damage infrastructure such as homes, roads, power grids, farmland, and freshwater sources, while increasing stress on coastal ecosystems. The declaration also considers risks to livelihoods, cultural heritage, and communities subjected to recurrent coastal flooding. Discussions among governments included international cooperation strategies as countries confront the physical and legal consequences of shifting coastlines. This meeting followed a 2024 decision by the General Assembly to enhance global efforts on sea-level rise.
UN Framework Prioritizes Resilience and Climate Mitigation
Guterres called for urgent action across three main areas: reducing emissions, safeguarding communities, and closing legal gaps created by rising seas. He also stressed the importance of accelerating renewable energy deployment and adopting stronger energy-efficiency policies to meet global emissions targets. Strategies for adaptation include building resilient infrastructure, establishing reliable warning systems, and providing support to communities increasingly vulnerable to coastal hazards. The United Nations recognizes sea-level rise as a significant obstacle to development, food security, and economic stability. Coastal impacts can also disrupt transportation networks and international trade activities.
Scientific evaluations project that sea levels will continue to climb throughout the 21st century as ocean temperatures rise and land-based ice melts. The IPCC states that sea-level rise will persist for centuries to millennia because of the slow response of oceans and ice sheets to warming. Additionally, WMO has warned that the effects of ocean warming and sea-level rise will last for hundreds of years. The new UN declaration offers a comprehensive framework addressing resilience, financial support, scientific research, and international legal issues. Its adoption elevates sea-level rise to a central position among the key climate challenges to be addressed during the General Assembly’s high-level meetings in 2026.