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<p>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, we 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. Our stochastic simulations suggest that enhanced alkalinity production under seaweed farms could remove an average of ~0.85 tonnes of carbon dioxide per hectare per year (range: ~0.1–2 tonnes per hectare per year). These findings highlight a previously underappreciated mechanism of ocean-based carbon dioxide removal associated with seaweed farming. Monetizing this carbon removal—through voluntary carbon markets, policy incentives, or supply-chain insetting—could provide an additional income stream, supporting both the economic viability of seaweed aquaculture and its potential to scale as a climate mitigation strategy.</p>

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Seaweed farms enhance alkalinity production and carbon capture

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月8日

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  • Mojtaba Fakhraee,
  • Noah J. Planavsky

摘要

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, we 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. Our stochastic simulations suggest that enhanced alkalinity production under seaweed farms could remove an average of ~0.85 tonnes of carbon dioxide per hectare per year (range: ~0.1–2 tonnes per hectare per year). These findings highlight a previously underappreciated mechanism of ocean-based carbon dioxide removal associated with seaweed farming. Monetizing this carbon removal—through voluntary carbon markets, policy incentives, or supply-chain insetting—could provide an additional income stream, supporting both the economic viability of seaweed aquaculture and its potential to scale as a climate mitigation strategy.