Potential Impacts of CO ₂ Injection on Deep-Sea Biota

TLDR

Efforts to reduce CO₂ emissions increasingly target the oceans, using approaches such as iron fertilization or deep‑sea CO₂ injection. The study aims to assess how deep‑sea CO₂ injection affects marine organisms and to determine the risks and benefits of this carbon storage strategy. The authors warn that even minor changes in CO₂ or pH can significantly impact deep‑sea ecosystems and global biogeochemical cycles.

Abstract

Efforts to reduce carbon dioxide emissions are increasingly looking to the oceans, either through iron fertilization programs (see this week9s Policy Forum by Chisholm et al.) or through COinjection into the deep sea. In their Perspective, Seibel and Walsh investigate how such deep-sea disposal may affect organisms that live in these environments. They warn that even small perturbations in COor pH may have important consequences for deep-sea ecosystems and for global biogeochemical cycles. Detailed studies into these effects are needed before the risks and benefits of deep-sea carbon storage can be assessed appropriately.