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Running Tide

Portland, Maine, USA

Region Active:


Environmental service company


Marine vegetation, Kelp farming, Climate change


Running Tide describes itself as a global ocean health company. With the mission of healing climate-damaged fisheries and of capturing carbon, they aim to sequester carbon in seaweed grown on wooden buoys, then sunk in deep water. Running Tide’s idea is to fight climate change by growing macroalgae—seaweed—on tiny ocean floats made from waste wood coated with calcium carbonate. As the carbon-rich seaweed grows, it weighs down its buoy and eventually sinks, depositing all that carbon on the seabed. This research is currently being conducted in Iceland.

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