OceanAlkalinityEnhancement(OAE)forCarbonRemoval

Why It Matters

Ocean acidification, caused by excess CO2 absorption, threatens marine calcifiers (corals, shellfish) and marine food webs, impacting fisheries worth billions and the health of the entire ocean ecosystem. OAE could significantly reduce atmospheric CO2, combat ocean acidification, and restore marine biodiversity, leading to healthier oceans and more resilient coastal communities. Coastal communities and marine industries (fishing, aquaculture) would stand to gain, while unexpected ecological shifts or mineral supply chain issues could pose risks. Major technical hurdles include efficient, cost-effective, and environmentally safe methods for mineral dissolution and dispersion at scale, along with comprehensive monitoring of ecological impacts. Initial pilot deployments are anticipated in the 2030s, with scalable solutions potentially by 2050, dependent on robust environmental impact assessments. Germany, the UK, and the US are actively funding OAE research. A second-order consequence could be unintended changes in trace metal availability or nutrient cycling in marine ecosystems, potentially altering phytoplankton blooms and broader food web dynamics.