UNESCO Report Identifies Critical Gap in Ocean Carbon Research That Could Undermine Climate Predictions

Paris, 14 February 2026 — A new report published by the UNESCO Intergovernmental Oceanographic Commission (IOC) warns that a major blind spot in ocean carbon research could significantly undermine the reliability of global climate predictions.

The Biological Carbon Pump

The ocean is the world's largest active carbon sink, absorbing approximately 25 per cent of annual anthropogenic CO₂ emissions. A critical, yet insufficiently studied, mechanism governing this uptake is the biological carbon pump — the process by which marine organisms convert dissolved CO₂ into organic matter at the ocean's surface, which then sinks to the deep ocean, effectively sequestering carbon for centuries to millennia.

The IOC report finds that current observational networks provide highly incomplete coverage of this process, particularly in the Southern Ocean, Arctic regions, and deep-sea environments. As a result, Earth System Models used by the Intergovernmental Panel on Climate Change (IPCC) carry substantial uncertainties in their projections of ocean carbon uptake under different warming scenarios.

Implications for Climate Projections

The uncertainty introduced by inadequate biological pump monitoring has downstream implications for projections of atmospheric CO₂ concentrations, global mean surface temperatures, and regional sea-level rise patterns. The report notes that under high-emission scenarios, errors in ocean carbon uptake estimates could translate into underestimates of atmospheric warming of up to 0.5°C by 2100.

Call for Expanded Monitoring Networks

UNESCO-IOC calls for a coordinated international effort to establish a comprehensive Deep Ocean Biological Carbon Pump Observation System. This would require deployment of additional Argo biogeochemical floats, gliders, moorings, and satellite sensors, as well as investment in artificial intelligence-based data integration platforms.

UNESCO estimates the cost of establishing adequate global monitoring at approximately USD 1.2 billion over ten years — a fraction of the economic damage that could result from miscalibrated climate mitigation policies.