Carbon Removal at Sea: The Science, Startups, and Stakes of Ocean-Based Solutions

Halifax Harbour, Nova Scotia – On a crisp autumn morning, a team of scientists and engineers quietly pumped a milky “antacid” slurry into the sea. The mixture of alkaline mineral – essentially an ocean-safe antacid – diffused into the harbor waters, neutralizing a bit of acidity and sparking a chemical drawdown of carbon dioxide from the air​. This unconventional climate experiment, led by Canadian startup Planetary Technologies, is part of a bold new wave of ocean-based carbon removal trials. As the world scrambles to slow global warming, efforts like this illustrate both the urgency and the uncertainty of turning our oceans into allies against climate change.

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