UN Warns Ocean Stress Accelerating as Sea Levels Rise Faster
Key Developments:
- The United Nations says oceans are facing “severe and accelerating” pressure from climate change, pollution and overexploitation.
- The rate of global sea-level rise has more than doubled over the past decade, reaching 4.3 millimetres annually in 2023.
- Scientists warn that rising ocean temperatures, plastic pollution and biodiversity loss are increasing risks for marine ecosystems and coastal populations.
NEW YORK (UN/World Ocean Assessment) — June 10, 2026: The United Nations has warned that the world’s oceans are under growing pressure from climate change, pollution, overfishing and other human activities, with scientists reporting an accelerating deterioration in marine ecosystems across the globe.
The findings were published in the UN’s Third World Ocean Assessment, a major scientific review involving nearly 600 researchers from 86 countries. The report evaluates changes in ocean health between 2021 and 2025 and highlights increasing environmental stress across marine ecosystems.
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Among the report’s most significant findings is the acceleration in sea-level rise. According to the assessment, the annual rate increased from approximately 2 millimetres before 2015 to 4.3 millimetres in 2023, raising concerns for millions of people living in low-lying coastal areas.
Scientists also found that around 16 percent of the total increase in global ocean heat recorded since 1955 occurred after 2018, underscoring the pace at which oceans are absorbing excess heat generated by global warming.
UN Secretary-General António Guterres stressed the urgency of collective action, saying: “We cannot keep treating the ocean as limitless. Urgent global collaboration is needed to protect marine ecosystems.”
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He further stated: “We must build a new relationship with the ocean grounded in science, framed by international law and built on shared responsibility across nations, sectors and generations.”
The report notes that oceans cover more than 70 percent of the Earth’s surface and play a crucial role in regulating climate. According to the assessment, oceans have absorbed approximately 90 percent of excess heat generated by human-induced warming and around 30 percent of carbon dioxide emissions released into the atmosphere.
Researchers also highlighted growing concerns over marine pollution. The assessment estimates that more than 52 million tonnes of plastic enter the oceans each year, contributing to trillions of microplastic particles that affect thousands of marine species.
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Large gaps in scientific knowledge remain. Despite advances in marine research, only about 27 percent of the ocean floor has been mapped, leaving many deep-sea ecosystems poorly understood.
Rafael González-Quirós emphasized the importance of international cooperation and research, stating: “The imperative for a healthy and resilient ocean has never been more urgent.”
He added that improved scientific understanding is helping researchers assess “the profound changes” occurring within marine ecosystems and identify areas requiring urgent attention.
The report also notes progress in international ocean governance, including the implementation of the High Seas Treaty, which establishes new mechanisms for protecting marine biodiversity in waters beyond national jurisdictions. However, researchers concluded that global ocean governance remains fragmented and requires stronger coordination among governments and international institutions.
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Separately, environmental organization Greenpeace described the report as an “urgent wake-up call” and renewed calls for expanded marine protected areas. Those comments represent the organization’s advocacy position and are separate from the findings of the UN assessment.
Waves crash over Tynemouth pier in north-east England. Sea levels were rising at 2mm a year before 2015 but the rate reached 4.3mm a year by 2023.
Photograph: Owen Humphreys/PA.
According to the report, population growth, coastal development, technological change and environmental pressures continue to increase demands on marine resources. More than one-third of the world’s population now lives within 100 kilometres of a coastline, while millions reside in areas vulnerable to rising sea levels and extreme weather events.
The UN assessment concludes that stronger international cooperation, improved monitoring systems and science-based policies will be necessary to protect marine ecosystems and reduce long-term risks to biodiversity, food security and coastal communities worldwide.
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