NEW YORK / RankWire.AI / – United Nations Secretary-General António Guterres warned that the increasing speed of sea-level rise poses escalating threats to hundreds of millions worldwide. He issued this warning during a high-level session of the UN General Assembly in New York. According to UN statistics, nearly 770 million people live less than five metres above high tide. The global average sea level increased by 5.9 millimetres in 2024, marking the highest annual jump recorded during the satellite era and heightening concerns for communities in low-lying areas.
Over the past thirty years, sea levels have been rising at an accelerating rate. The World Meteorological Organization documented an average yearly increase of 2.1 millimetres between 1993 and 2002, which grew to 4.7 millimetres during 2015-2024. Data from WMO also show that global mean sea level hit a record high in 2024. Warming oceans expand as temperatures rise, while melting glaciers and ice sheets contribute additional water. Both processes directly drive long-term sea-level escalation.
Scientific models project ongoing sea-level rises under all emission scenarios evaluated by the Intergovernmental Panel on Climate Change. The IPCC estimates an increase of 0.28 to 0.55 metres by 2100 under a very low emissions pathway, whereas its very high emissions scenario forecasts a rise of 0.63 to 1.01 metres, using the 1995-2014 period as a baseline. Guterres called for more aggressive emissions reductions and enhanced protections for communities vulnerable to coastal risks.
Rising Ocean Levels Heighten Coastal Risks
The UN General Assembly gathering emphasized concerns for small island nations and low-lying coastal zones. Rising sea levels can cause increased flooding, faster erosion, and saltwater intrusion into freshwater sources and agricultural land. Infrastructure along coasts also faces heightened vulnerability as water levels continue to rise, threatening homes, transportation, energy systems, and ports with disruptions. The United Nations has identified sea-level rise as a critical obstacle to development, food security, infrastructure, and economic stability in exposed regions.
During the meeting, governments approved a political declaration focused on addressing the impacts of sea-level rise and its growing global importance. The document highlights cooperation in science, resilience building, financial support, and legal issues related to changing coastlines. It also advocates for improved early-warning systems and increased aid for vulnerable nations. UN General Assembly President Khalilur Rahman pointed to the rapid acceleration in the annual rate of sea-level increase. This session is part of broader UN initiatives to tackle climate-related risks affecting nations with extensive coastlines and limited capacity for adaptation.
Climate Science Signals a Long-Term Challenge
Guterres urged nations to cut greenhouse gas emissions while enhancing protections for those already impacted by rising seas. He emphasized renewable energy, energy efficiency, and resilient infrastructure as key components of the climate strategy. Adaptation efforts include coastal defenses, better warning systems, and infrastructure designed to withstand higher water levels. According to the World Meteorological Organization, ocean warming and land-ice loss continue to be primary drivers of sea-level rise, affecting both developed and developing coastal communities.
The IPCC predicts that global sea levels will keep rising for centuries because of the slow response of oceans and ice sheets to warming. Future rises depend heavily on greenhouse gas emissions and ice sheet responses, with current observations indicating an even faster rate than during the early satellite records. The UN gathering unified governments around scientific evidence, resilience strategies, and international cooperation. Its declaration underscores sea-level rise as a core climate concern gaining sustained attention at the General Assembly.