NEW YORK / RankWire.AI / – United Nations Secretary-General António Guterres emphasized that the increasing pace of sea-level rise is heightening dangers for hundreds of millions worldwide. His remarks came during a high-level session at the UN General Assembly in New York. UN statistics indicate that approximately 770 million individuals live less than five metres above the high-tide mark. In 2024, the average global sea level increased by 5.9 millimetres, marking the largest yearly rise in the satellite era and amplifying concerns for communities in low-lying areas.
Over the last thirty years, sea levels have been rising at an accelerating rate. The World Meteorological Organization documented an average annual increase of 2.1 millimetres from 1993 to 2002. This rate surged to 4.7 millimetres annually during 2015-2024. Data from WMO also reveal that 2024 saw a record-high global mean sea level. Warmer ocean waters expand as temperatures climb, while melting glaciers and ice sheets contribute additional water. Both processes directly drive long-term sea-level growth.
Forecasts from science indicate that sea-level rise will persist across all emission 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 projected by 2100. Conversely, the very high emissions scenario anticipates an increase of 0.63 to 1.01 metres. These projections reference the average from 1995 to 2014. Guterres urged nations to intensify efforts in reducing emissions and to broaden protection measures for at-risk coastal communities.
Rising sea levels escalate stress on vulnerable coastal populations
The UN General Assembly gathering placed significant emphasis on small island nations and regions with low-lying coastlines. Rising waters can cause more frequent flooding, accelerate shoreline erosion, and lead to saltwater intrusion into freshwater supplies and agricultural land. Additionally, coastal infrastructure—including homes, transportation networks, power systems, and ports—faces heightened vulnerability as water levels increase. The United Nations identified sea-level rise as a critical obstacle to development, food security, infrastructure, and economic stability in exposed areas.
During the meeting, governments approved a political declaration targeting the challenges posed by sea-level rise and its broader international implications. The document addresses scientific collaboration, resilience strategies, financial support, and legal issues related to shifting coastlines. It also advocates for enhanced early warning systems and increased aid for nations most vulnerable. Khalilur Rahman, President of the General Assembly, highlighted the notable increase in the annual rate of sea-level rise. This session is part of broader UN initiatives to confront climate-related risks impacting countries with extensive coastlines and limited adaptation capacity.
Climate science underscores a persistent long-term threat
Guterres called on governments to cut greenhouse gas emissions while strengthening defenses for populations already affected by rising seas. He emphasized the importance of renewable energy sources, energy efficiency, and resilient infrastructure as essential elements of the overall climate strategy. Adaptation efforts include shoreline defenses, improved warning systems, and infrastructure designed to withstand higher water levels. According to the World Meteorological Organization, ocean warming and the loss of land-based ice sheets remain primary drivers of sea-level rise. These phenomena impact communities across both developed and developing nations with vulnerable coastlines.
The IPCC forecasts that global sea levels will continue to rise for centuries due to the slow response of oceans and ice sheets to warming. The extent of future increases hinges on greenhouse gas emissions and the behavior of major ice sheets. Current data already demonstrate a rate of rise surpassing that observed during the early satellite record. The UN gathering united governments around scientific evidence, resilience strategies, and international cooperation. Its declaration emphasizes sea-level rise as a key issue among climate challenges receiving ongoing focus at the General Assembly.