Tag: ocean-based CDR

Peer-reviewed Publications

Marquez et al. (2026): Electrochemical Ocean-Based Carbon Capture: Roadblocks to Scale-Up

Raul A. Marquez, Adam C. Nielander, Joaquin Resasco, Thomas F. Jaramillo and C. Buddie Mullins, IN: ACS Energy Letters, https://doi.org/10.1021/acsenergylett.5c04249

Electrochemical ocean-based negative emission technologies (EC-ONETs) are emerging strategies that harness the ocean’s capacity for carbon dioxide removal. These systems can couple carbon capture with renewable electricity and water treatment infrastructure and, in the long term, support more ambitious industrial and environmental remediation projects. However, progress—from early demonstrations to deployment at scale—hinges on a more nuanced understanding of electrochemical and transport phenomena in seawater, rigorous field validation, and identification of ecological risks. In this Perspective, the authors map the current portfolio of EC-ONETs, synthesize reported performance metrics, and outline their limitations and future opportunities.

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Peer-reviewed Publications

Fakhraee & Planavsky (2026): Seaweed farms enhance alkalinity production and carbon capture

Mojtaba Fakhraee and Noah J. Planavsky, IN: Communications Sustainability, https://doi.org/10.1038/s44458-025-00004-8

Seaweed aquaculture is increasingly being explored as a sustainable source of food and industrial processing feedstock, as well as a potential climate solution through carbon dioxide removal. In this study, the authors use a sediment diagenetic model to quantify how elevated organic carbon fluxes beneath seaweed farms enhance sedimentary alkalinity fluxes, contributing to long-term carbon dioxide sequestration.

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Peer-reviewed Publications

Raven et al. (2025): Ideas and Perspectives: Max MACS – constraining the potential global scale of Marine Anoxic Carbon Storage for CO₂ removal

Morgan Reed Raven, Nitai Amiel, Dror L. Angel, James P. Barry, Thomas M. Blattmann, Laura Boicenco, Antoine Crémière, Natalya Evans, Nora Gallarotti, Sebastian Haas, Jan-Hendrik Hehemann, Pranay Lal, David Lordkipanidze, Tiia Luostarinen, Aaron M. Martinez, Allison J. Matzelle, Selma Menabit, Mihaela Muresan, Andreas Neumann, Jean-Daniel Paris, Christopher R. Pearce, Nick Reynard, Daniel L. Sanchez, Florence Schubotz, Violeta Slabakova, Adrian Stanica, Andrew K. Sweetman, Tina Treude, Yoana G. Voynova and D. Nikolaos Zarokanellos, IN: EGUSphere, https://doi.org/10.5194/egusphere-2025-6086

Building on the results of a workshop in Bucharest, Romania in 2025, the authors discuss the potential impacts of MACS activities on the ecology, biogeochemistry, economy, and community around the Black Sea, seafloor brines, and other anoxic marine sites.

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Liu et al. (2025): Integrating experimental and geochemical modelling for productive carbon dioxide mineralization in the South China Sea

Bo Liu, Erfan Mohammadian, Amin Azdarpour, Rahim Masoudi, Chenlu Xu and Boyang Wang, IN: Communications Earth & Environment, https://doi.org/10.1038/s43247-025-02988-6

Reaching carbon neutrality requires innovative and scalable carbon sequestration technologies. Here, the authors present an enhanced ex-situ mineral carbonation method using South China Sea seawater and calcium-rich additives for carbon dioxide storage. The authors conducted high-pressure (50–500 atm) laboratory experiments using calcium oxide, calcium hydroxide, and wollastonite, and performed numerical geochemical simulations.

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Peer-reviewed Publications

Verma & Gautam (2025): Mitigating atmospheric carbon dioxide through ocean-based carbon capture technologies: a delay mathematical model

Maitri Verma and Cherie Gautam, IN: The European Physical Journal Plus, https://doi.org/10.1140/epjp/s13360-025-06881-1

In this study, the authors develop a nonlinear mathematical model to examine how budget allocation for ocean-based carbon removal technologies and shellfish farming, along with delays between investment and impact, influences atmospheric CO₂ dynamics. The model considers that a portion of total budget is allocated for the implementation of ocean-based carbon removal technologies, while the remainder is invested in shellfish farming. The formulated model is qualitatively analyzed to determine the system’s behavior in the long run.

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Peer-reviewed Publications

Delval et al. (2025): Life cycle assessment of ocean-based carbon dioxide removal approaches: A systematic literature review

Mona H. Delval, Nils Thonemann, Patrik J.G. Henriksson, Samantha E. Tanzer, Paul Behrens, IN: Renewable and Sustainable Energy Reviews, https://doi.org/10.1016/j.rser.2025.116091

As climate impacts worsen, novel technologies to draw down atmospheric carbon are gaining attention. One such approach is ocean-based carbon dioxide removal (OCDR). However, the potential environmental side-effects of large-scale OCDR deployment remain understudied. Here, the authors present a systematic literature review of the life cycle assessments (LCAs) of OCDR approaches.

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Peer-reviewed Publications

Delval et al. (2025): Life cycle assessment of ocean-based carbon dioxide removal approaches: A systematic literature review

Mona H. Delval, Nils Thonemann, Patrik J.G. Henriksson, Samantha E. Tanzer and Paul Behrens, IN: Renewable and Sustainable Energy Reviews, https://doi.org/10.1016/j.rser.2025.116091

As climate impacts worsen, novel technologies to draw down atmospheric carbon are gaining attention. One such approach is ocean-based carbon dioxide removal (OCDR). However, the potential environmental side-effects of large-scale OCDR deployment remain understudied. Here, the authors present a systematic literature review of the life cycle assessments (LCAs) of OCDR approaches.

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Reports

Report: Report on a sustainable development goals framework for ocean-based NET evaluation

David P. Keller and Wilfried Rickels, GEOMAR, January 2024

This report describes a CDR SDG assessment framework that was developed for future use in evaluating the sustainability of different ocean-based CDR options or portfolios. The assessment methodology describes how the user should first collect relevant information about the CDR approach(es) and then match it to the corresponding SDG indicators or sub-indicators. After that the user must transform (normalize) the derived indicator data for comparability. Then, the user must follow several steps of weighting, aggregation, and evaluation that follow an SDG structured nesting approach. In the end the methodology allows the user to quantify CDR impacts on progress towards attaining overall “sustainability”. No application of the framework was done as part of this task, but should be done in future research endeavors.

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Events

Webinar: MRV for Ocean-Based CDR: Spotlight on CDR Suppliers

Thursday, November 30, 7 – 8pm CET

Join Ocean Visions for the second webinar in their series on current innovations in measurement, reporting, and verification (MRV) for ocean-based carbon dioxide removal (CDR). They will spotlight leading startups doing electrochemical CDR to get a deeper understanding of the current state of MRV science, how it’s being applied, and the challenges and solutions advancing this important field. Talks by CDR scientists Erika La Plante, PhD (Equatic) and Sophie Chu, PhD (Captura) will be followed by a moderated audience Q&A.

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