How is carbon removal affecting marine life?

First test of CO2 removal with green sand

A pilot project tested whether spreading olivine (“green sand”) on the seafloor to remove atmospheric CO2 could harm marine ecosystems. Scientists looked for signs of adverse effects on benthic organisms and reported none—at least at the level detectable in the trial.

What was done

Olivine is a silicate mineral that can react with CO2 over time, helping lock carbon away as solid carbonates. In the experiment, material was added to the ocean floor in a controlled manner in New York state waters, with biological monitoring focused on local seafloor life.

Why it matters

Carbon removal methods are often discussed mainly in terms of climate benefit and cost. But offshore deployment raises immediate ecological questions: organisms living on or near sediments could be exposed to changes in chemistry, suspended particles, or altered mineral surfaces. If an approach shows no detectable harm in early trials, it makes later scaling—paired with stronger monitoring and regulation—more plausible.

What’s still missing

Because it was a pilot, key details like long-term ecosystem effects and how results generalize across different sites, depths, and ocean conditions were not provided in the story. For decision-makers, that means the next step is likely repeated trials with longer monitoring periods and transparent environmental risk assessments.

• Early evidence reported no harm to marine life in the pilot.
• Ecological confidence will depend on longer, larger studies.
• Monitoring will be central if the method moves toward scaled deployment.