Sinking Sargassum for Sequestration

 Seagriculture EU 2024

Francesco Fiondella presents this video clip from Science for the Planet, a short explainer series about how Columbia Climate School scientists and scholars are trying to understand the effects of climate change and help solve the crisis. In this edition biological oceanographer Ajit Subramaniam, from the Climate School’s Lamont-Doherty Earth Observatory, explains how sargassum seaweed might help reduce carbon dioxide levels in our atmosphere.

He’s studying the practicality and impacts of sinking massive amounts of the surface-growing plant down to the seafloor, which would trap it — and the carbon it absorbs.

“The idea is that if you collect the sargassum offshore where ocean depths are about 2,000 meters and you sink it to the seafloor quickly, then you would be taking out the carbon dioxide that was fixed — that’s making up this biomass — and basically put it out of contact with the atmosphere for at least 100 years,” says Subramaniam.

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