Ocean dumping – or a climate solution?

From the grounds of a gas-fired power plant on the eastern shores of Canada, a little-known company is pumping a slurry of minerals into the ocean in the name of stopping climate change.Whether it’s pollution or a silver bullet that will save the planet may depend on whom you ask.From shore, a pipe releases a mixture of water and magnesium oxide – a powdery white mineral used in everything from construction to heartburn pills that Planetary Technologies, based in Nova Scotia, is betting will absorb more planet-warming gases into the sea.“Restore the climate. Heal the ocean,” reads the motto stamped on a shipping container nearby.Planetary is part of a growing industry racing to engineer a solution to global warming using the absorbent power of the oceans. It is backed by US$1 million from Elon Musk’s foundation and competing for a prize of US$50 million more.Dozens of other companies and academic groups are pitching the same theory: that sinking rocks, nutrients, crop waste or seaweed in the ocean could lock away climate-warming carbon dioxide for centuries or more. Nearly 50 field trials have taken place in the past four years, with startups raising hundreds of millions in early funds.But the field remains rife with debate over the consequences for the oceans if the strategies are deployed at large scale, and over the exact benefits for the climate. Critics say the efforts are moving too quickly and with too few guardrails.“It’s like the Wild West. Everybody is on the bandwagon, everybody wants to do something,” said Adina Paytan, who teaches earth and ocean science at the University of California, Santa Cruz.Planetary strategies Planetary, like most of the ocean startups, is financing its work by selling carbon credits – or tokens representing one metric ton of carbon dioxide removed from the air. Largely unregulated and widely debated, carbon credits have become popular this century as a way for companies to purchase offsets rather than reduce emissions themselves. Most credits are priced at several hundred dollars apiece.The industry sold more than 340 000 marine carbon credits last year, up from just 2 000 credits four years ago, according to the tracking site CDR.fyi. But that amount of carbon removal is a tiny fraction of what scientists say will be required to keep the planet liveable for centuries to come.Those leading the efforts, including Will Burt, Planetary’s chief ocean scientist, acknowledge they’re entering uncharted territory – but say the bigger danger for the planet and the oceans is not moving quickly enough.“We need to understand if it’s going to work or not. The faster we do, the better.”Vacuuming carbon into the seaEfforts to capture carbon dioxide have exploded in recent years.Most climate models now show that cutting emissions won’t be enough to curb global warming, according to the United Nations’ Intergovernmental Panel on Climate Change. The world needs to actively remove heat-trapping gases, as well – and the ocean could be a logical place to capture them.Money has already poured into different strategies on land – among them, pumping carbon dioxide from the air, developing sites to store carbon underground and replanting forests, which naturally store CO2. But many of those projects are limited by space and could impact nearby communities. The ocean already regulates Earth’s climate by absorbing heat and carbon, and by comparison, it seems limitless.“Is that huge surface area an option to help us deal with and mitigate the worst effects of climate change?” asked Adam Subhas, who is leading a carbon removal project with the Woods Hole Oceanographic Institution, based on Cape Cod, Massachusetts.

Ocean dumping – or a climate solution?

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Namibian Sun 2025-04-01

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Ocean dumping – or a climate solution?

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Namibian Sun 2025-04-01

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