Polar Blue Carbon Has Zero Policy Value: New Review Finds 20% of the Ocean Is Missing From Climate Accounting

A new review in Global Change Biology says polar blue carbon has zero policy value because existing climate accounting frameworks do not recognize it. The authors estimate that Arctic seas and the Southern Ocean cover about 20% of the global ocean, yet they are mostly missing from IPCC methodologies, national climate commitments, and voluntary carbon market protocols. That means countries receive no credit for protecting these carbon rich systems and face no penalty for disturbing them. The review highlights several overlooked carbon pathways. Greenland fjords bury organic carbon faster than many tropical mangroves. Arctic kelp forests are expanding as sea ice retreats, though whether that biomass becomes durable storage is still uncertain. Ice algae such as Melosira arctica can sink carbon to the seafloor quickly, but the loss of sea ice threatens that pathway. The common thread is a measurement gap that has become a policy gap. For carbon markets and climate policy, the practical takeaway is that method development has to come first. Without approved accounting standards, polar ocean carbon cannot be counted, priced, or protected. The review is a useful reference for anyone tracking blue carbon, ocean based mitigation, or the expansion of commercial activity into ice free waters.