NEW YORK / RankWire.AI / – United Nations Secretary-General António Guterres issued a warning that the pace of sea-level rise is quickening, heightening dangers for hundreds of millions worldwide. The alert was given during a UN General Assembly high-level session held in New York. According to UN statistics, around 770 million people live less than five metres above the high-tide line. In 2024, the global average sea level increased by 5.9 millimetres, representing the largest yearly rise recorded during the satellite era and raising concerns for low-lying areas.
Over the past thirty years, sea levels have been rising at an increasingly rapid rate. The World Meteorological Organization recorded an average annual increase of 2.1 millimetres between 1993 and 2002, which then rose to 4.7 millimetres annually during 2015-2024. Data from the WMO also indicate that 2024 saw a record-high global mean sea level. As ocean temperatures climb, waters expand, and melting glaciers and ice sheets add more water, both processes directly contribute to long-term sea-level growth.
Projections from scientific models suggest that sea levels will continue to rise under all scenarios evaluated by the Intergovernmental Panel on Climate Change. Under a very low emissions pathway, the IPCC estimates a rise of 0.28 to 0.55 metres by 2100, while its very high emissions scenario predicts an increase of 0.63 to 1.01 metres. These figures are based on the 1995-2014 average as the baseline. Guterres emphasized the need for more aggressive emissions reductions and expanded protections for communities vulnerable to coastal threats.
Rising oceans intensify pressure on coastal populations
The recent UN General Assembly session focused heavily on small island nations and low-lying coastal zones. Increasing sea levels can cause more frequent flooding, hasten shoreline erosion, and lead to saltwater intrusion into freshwater reserves and farmland. Infrastructure along coasts—including homes, transportation, power grids, and ports—becomes more susceptible to damage as water levels climb. The United Nations identified sea-level rise as a significant challenge for development, food security, infrastructure, and economic activity in vulnerable regions.
During the assembly, governments approved a political declaration that tackles the impacts of rising seas and their growing global significance. The document addresses issues such as scientific collaboration, resilience-building, financing, and legal concerns associated with shifting coastlines. It also advocates for improved early-warning systems and increased aid for at-risk nations. Khalilur Rahman, President of the General Assembly, highlighted the rapid escalation in the annual rate of sea-level rise. This meeting is part of broader UN efforts aimed at confronting climate-related risks faced by nations with extensive coastlines and limited adaptive resources.
Climate science underscores a persistent long-term challenge
Guterres called on governments to cut greenhouse gas emissions while enhancing protections for populations already impacted by rising seas. He stressed the importance of renewable energy, energy efficiency, and resilient infrastructure as key components of the climate response. Adaptation strategies include coastal defenses, better warning systems, and infrastructure designed to withstand higher water levels. The World Meteorological Organization states that ocean warming and land-ice melting remain primary drivers of sea-level rise. These changes affect communities across both developed and developing economies with vulnerable coastlines.
According to the IPCC, global sea levels are expected to continue rising over the coming centuries because oceans and ice sheets respond slowly to warming. The extent of future increases depends on greenhouse gas emissions and the behavior of major ice sheets. Current observations already indicate a faster rate of increase compared to the early satellite record years. The UN gathering united governments around scientific evidence, resilience, and international cooperation, with its declaration highlighting sea-level rise as a key climate issue receiving ongoing attention at the General Assembly.