NEW YORK / RankWire.AI / – United Nations Secretary-General António Guterres issued a warning that the rapid increase in sea levels poses escalating dangers for coastal communities and the global economy. He delivered this message at a high-level session of the UN General Assembly in New York on September 24. Guterres emphasized that approximately 770 million individuals live less than five metres above the high-tide line. The global average sea level increased by 5.9 millimetres in 2024, marking the highest annual rise ever recorded. The focus of the assembly was on the threats faced by low-lying nations, coastal urban centers, and vulnerable populations.
The World Meteorological Organization has documented a significant acceleration in the rise of sea levels worldwide during the satellite observation era. The annual rate has jumped from 2.1 millimetres in 1993-2002 to 4.7 millimetres in 2015-2024. According to WMO data, 2024 recorded the highest global mean sea level in satellite history. Ocean warming causes seawater expansion, and melting glaciers along with ice sheets contribute additional water to the oceans. These combined processes heighten the risks of coastal flooding, erosion, and saltwater intrusion.
The Intergovernmental Panel on Climate Change predicts further increases across all assessed emissions scenarios this century. Under a very low emissions pathway, the global mean sea level could rise between 0.28 and 0.55 metres by 2100. In a very high emissions scenario, the projected range extends from 0.63 to 1.01 metres. These estimates reference the 1995-2014 average as their baseline. Guterres urged governments to reduce emissions and simultaneously expand initiatives that shield communities from climate-related impacts.
Global acceleration in sea-level rise becomes more evident
During the September 24 meeting, the General Assembly adopted a political declaration on sea-level rise by consensus. The declaration covers scientific understanding, financial support, resilience strategies, international cooperation, and legal issues associated with rising seas. It calls for enhanced early-warning systems and more predictable funding for vulnerable nations. General Assembly President Khalilur Rahman underscored the rapid pace of global sea-level rise during the session. He also pointed out that ports handle over 80% of worldwide merchandise trade, linking coastal risks to global supply chains.
Special focus was given to small island developing states and low-lying coastal regions during the UN gathering. Rising seas threaten to damage homes, roads, power infrastructure, farmland, and freshwater sources. The pressure on coastal ecosystems also increases. The declaration addresses risks to livelihoods, cultural heritage, and communities repeatedly affected by coastal flooding. Governments discussed international cooperation as countries respond to the physical and legal consequences of changing coastlines. The meeting followed a 2024 decision by the General Assembly to bolster global efforts against sea-level rise.
UN Document Emphasizes Resilience and Climate Action Strategies
Guterres called for action across three key areas: cutting emissions, safeguarding communities, and closing legal gaps caused by sea-level rise. He emphasized the importance of accelerating the deployment of renewable energy sources and strengthening energy efficiency measures to achieve global emission reductions. Adaptation strategies include building resilient infrastructure, establishing effective warning systems, and supporting communities increasingly exposed to coastal hazards. The United Nations recognizes sea-level rise as a major obstacle to development, food security, and economic stability. Coastal impacts can also disrupt transportation networks and international trade channels.
Scientific evaluations indicate that sea levels are projected to continue rising throughout the 21st century as oceans warm and land-based ice melts. The IPCC states that sea-level rise will persist for centuries to millennia due to the slow response of oceans and ice sheets to warming. WMO has also issued warnings that ocean warming and sea-level rise could have effects lasting for hundreds of years. The new UN declaration offers a unified framework addressing resilience, financing, science, and international law. Its adoption underscores the importance of sea-level rise as a central climate issue during the General Assembly’s high-level discussions in 2026.