Overview
- The United Nations released the third World Ocean Assessment on Monday, June 8, 2026, saying oceans have absorbed more than 90 percent of excess heat, about 30 percent of fossil-fuel CO2, and that global sea-level rise reached 4.3 mm per year in 2023.
- The report quantifies acute pressures including roughly 52.1 million tonnes of plastic entering the ocean each year and estimates that up to 24.4 trillion microplastic particles now affect more than 4,000 marine species.
- The WOA welcomed the January entry into force of the BBNJ treaty for high-seas biodiversity but warned that legal gaps, weak funding and limited monitoring mean protections fall far short of the 30 percent marine protected area goal for 2030.
- Authors flagged near-term threats to science and stewardship, noting advanced deep-sea mining exploration and reporting that the U.S. administration plans to remove hundreds of deep-ocean monitoring instruments, a move scientists say would create major data gaps.
- The assessment projects the Arctic could be ice-free in September by mid-century with earlier chances in the 2030s, warns reefs face near-collapse if warming exceeds 1.5°C, and calls for rapid emissions cuts, nature-based measures and expanded, better-funded monitoring to protect food security and coastal livelihoods.