NEW YORK / RankWire.AI / – United Nations Secretary-General António Guterres issued a stark warning that the increasing pace of sea-level rise is heightening risks for hundreds of millions of individuals worldwide. His alert was made during a high-level session of the UN General Assembly held 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 most substantial annual increase recorded during the satellite era and intensifying concerns for communities living 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 annual increase of 2.1 millimetres from 1993 to 2002. This rate more than doubled during 2015-2024, reaching 4.7 millimetres per year. Data from the WMO also indicate that 2024 saw the highest global mean sea level in recorded history. The warming of oceans causes expansion as temperatures increase, while melting glaciers and ice sheets contribute additional water. Both processes play a direct role in the long-term rise of sea levels.
Projections from scientific models 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 anticipated by 2100. Conversely, a scenario with very high emissions predicts an increase of between 0.63 and 1.01 metres. These estimates use the 1995-2014 period as a baseline. Guterres emphasized the need for more aggressive cuts in emissions and expanded protections for communities vulnerable to coastal hazards.
Rising ocean levels intensify pressures on vulnerable coastal populations
The UN General Assembly gathering emphasized concerns related to small island nations and low-lying coastal zones. Rising sea levels heighten the risks of flooding, accelerate shoreline erosion, and cause saltwater intrusion into freshwater sources and agricultural land. Infrastructure situated along coasts, such as homes, transportation systems, power grids, and ports, faces increasing exposure to these hazards. The United Nations has identified sea-level rise as a significant obstacle to development, food security, infrastructure stability, and economic growth in regions most exposed.
During the meeting, governments approved a political declaration focused on addressing sea-level rise and its expanding global impact. This document highlights scientific collaboration, resilience-building, financial support, and legal considerations related to changing coastlines. It also advocates for improved early-warning systems and increased assistance for vulnerable nations. Khalilur Rahman, President of the General Assembly, pointed out the notable surge in the annual rate of sea-level rise. This gathering is part of broader UN efforts aimed at tackling climate risks faced by countries with extensive coastlines and limited means for adaptation.
Scientific evidence underscores a persistent, long-term challenge
Guterres urged nations to curb greenhouse gas emissions while enhancing protections for populations already affected by rising seas. He emphasized the importance of renewable energy, increased energy efficiency, and resilient infrastructure as vital components of the comprehensive climate strategy. Key adaptation actions include coastal defenses, improved warning systems, and infrastructure designed to withstand higher water levels. The World Meteorological Organization states that ocean warming and land-ice loss remain dominant drivers of sea-level rise. These phenomena impact both developed and developing economies with vulnerable coastlines.
The IPCC forecasts that global sea levels will continue to climb for centuries due to the slow response of oceans and ice sheets to warming. The extent of future increases depends heavily on greenhouse gas emission levels and the response of major ice sheets. Current measurements already show a faster increase rate than during the initial years of satellite observations. The UN conference unified governments around scientific findings, resilience initiatives, and international cooperation. Its declaration elevates sea-level rise as a key issue in the ongoing climate change agenda discussed at the General Assembly.