NEW YORK / RankWire.AI / – United Nations Secretary-General António Guterres emphasized that the increasing speed of sea-level rise poses escalating threats for hundreds of millions worldwide. His alert was given during a high-level gathering at the UN General Assembly in New York. According to UN statistics, approximately 770 million people reside less than five metres above the high-tide mark. In 2024, the global average sea level climbed by 5.9 millimetres, marking the highest annual increase since the satellite data collection began, heightening concerns for communities in low-lying areas.
Over the last thirty years, the pace of sea-level rise has quickened significantly. The World Meteorological Organization recorded an average annual increase of 2.1 millimetres between 1993 and 2002, which surged to 4.7 millimetres annually during 2015-2024. Data from WMO also indicates that 2024 saw a record high in global mean sea level. Rising ocean temperatures cause expansion, while melting glaciers and ice sheets add additional water, both directly contributing to long-term sea-level increases.
Projections from scientists indicate that sea-level rise will continue across all emissions scenarios evaluated by the Intergovernmental Panel on Climate Change. Under a very low emissions pathway, a rise of 0.28 to 0.55 metres is predicted by 2100. The very high emissions scenario estimates an increase of 0.63 to 1.01 metres, with these figures based on the 1995-2014 average as the reference. Guterres called for more aggressive emissions reductions and expanded protections for communities vulnerable to coastal hazards.
Rising sea levels intensify pressures on coastal populations
During the UN General Assembly meeting, particular attention was given to small island nations and low-lying coastal zones. Rising seas heighten flood risks, accelerate shoreline erosion, and allow saltwater intrusion into freshwater sources and agricultural land. Coastal infrastructure—including homes, transportation networks, power facilities, and ports—is increasingly exposed to these hazards. The United Nations recognizes sea-level rise as a critical challenge impacting development, food security, infrastructure, and economic activity in vulnerable regions.
A political declaration adopted at the gathering addresses the global impact of sea-level rise, emphasizing scientific collaboration, resilience-building, financing, and legal issues related to changing coastlines. It advocates for enhanced early-warning systems and increased support for at-risk nations. Khalilur Rahman, President of the General Assembly, pointed out the sharp acceleration in the annual rate of sea-level rise. This summit is part of broader UN initiatives to tackle climate-related risks affecting countries with extensive coastlines and limited resources for adaptation.
Scientific insights highlight a persistent global challenge
Guterres urged governments to step up efforts to cut greenhouse gas emissions while simultaneously bolstering protections for populations already affected by rising seas. He highlighted the importance of renewable energy, increased energy efficiency, and resilient infrastructure as essential components of climate action. Adaptation strategies include shoreline defenses, improved early-warning systems, and infrastructure designed to withstand higher water levels. The World Meteorological Organization reports that ocean warming and land-ice melt remain primary drivers of sea-level rise, impacting both developed and developing nations with vulnerable coastlines.
The IPCC forecasts that sea levels will continue to rise for centuries because of the slow response of oceans and ice sheets to warming. The magnitude of future increases depends heavily on greenhouse gas emissions and the behavior of major ice sheets. Current data already shows a rate faster than in the early satellite record years. The UN gathering united governments around the importance of scientific evidence, resilience, and international cooperation. Its declaration elevates sea-level rise as a key climate issue receiving ongoing focus at the General Assembly.