Removing Carbon Dioxide Through Ocean Alkalinity Enhancement and Seaweed Cultivation: Legal Challenges and Opportunities
2021
This paper explores two ocean-based carbon dioxide removal strategies—ocean alkalinity
enhancement and seaweed cultivation. Ocean alkalinity enhancement involves adding alkalinity to
ocean waters, either by discharging alkaline rocks or through an electrochemical process, which
increases ocean pH levels and thereby enables greater uptake of carbon dioxide, as well as reducing
the adverse impacts of ocean acidification. Seaweed cultivation involves the growing of kelp and
other macroalgae to store carbon in biomass, which can then either be used to replace more
greenhouse gas-intensive products or sequestered.
This paper examines the international and U.S. legal frameworks that apply to ocean
alkalinity enhancement and seaweed cultivation. Depending on where they occur, such activities
may be subject to international, national, state, and/or local jurisdiction. Under international law,
countries typically have jurisdiction over activities within 200 nautical miles of their coastline. In the
U.S., coastal states typically have primary authority over areas within three nautical miles of the
coast, and the federal government controls U.S. waters further offshore.
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