Martocello et al. (2026): The State of Macroalgae Carbon Dioxide Removal: Insights from a Methodology Development Team

Donald Edward Martocello, Thomas Storwick, Carolyn Buchwald, IN: Frontiers in Climate

In the face of anthropogenic climate change, there is strong impetus to develop and implement durable carbon dioxide removal (CDR) technologies. CDR is an emerging private sector industry seeking to provide scientifically rigorous carbon offsets for entities unable to reduce carbon emissions below regulatory compliance or to support voluntary claims of carbon neutrality and reduction. Among nature-based CDR strategies, macroalgae (seaweed) cultivation is frequently cited as a promising and emerging pathway for ocean carbon storage in a variety of contexts. Despite widespread discussion in the literature and numerous papers that have modeled successful long-term storage by macroalgae cultivation, few field-scale studies exist and no accepted carbon crediting framework exists. Recently, a joint industry-academic partnership attempted to develop a rigorous ecologically-sound carbon credit methodology that aligned the goals of private sector and academic interests in macroalgae CDR.

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