Controversial carbon capture plans in west Cornwall have been scrapped, it has been confirmed.
The Planetary Technologies team wanted to release magnesium hydroxide into St Ives Bay and monitor how the chemical affected ocean acidity and carbon dioxide levels.
However, some people opposed the idea and the impact on wildlife and the environment.
On Wednesday, the company said the "scale-up of operations in Cornwall has been assessed as commercially unviable and we will not be pursuing a wider programme in the region."

The Planetary Technology team from Canada wanted to release Magnesium Hydroxide into St Ives Bay
>> In Other News: CO280 Signs Landmark 3.69 Million Tonne Agreement with Microsoft to Scale-up Carbon Dioxide Removal in the US Pulp and Paper Industry
On the company's website it said: "We worked with local utility South West Water and proposed the addition of a diluted form of the mineral magnesium hydroxide to the existing water flow at the water treatment plant in Hayle.
The company said adding the alkaline compound to the sea would help counter ocean acidity caused by climate change.
It said: "Planetary has successfully completed its trial operations in Cornwall, UK, gathering valuable scientific data and insights.
"Although the trial demonstrated great potential, we have decided not to pursue a full programme in Cornwall due to commercial infeasibility."
A spokesperson for Planetary Technologies added: "Cornwall has played a meaningful role in our development, and we are deeply grateful to the local partners, community, and team members who have supported our mission."
St Ives MP Andrew George said "more research and robust studies" needed to be carried out before chemicals were released into the environment.
He said: "There remained uncertainty regarding the potential impact of pumping these chemicals on marine wildlife.
"The studies undertaken had not satisfied the Cornwall Carbon Scrutiny Group, in that the baseline data remained incomplete, the control and diffuser sites weren't comparable and the target study species were not present at the time of the trials."
George said the decision was "good common sense for Cornwall, seals, safe seas and local economy".
Follow the money flow of climate, technology, and energy investments to uncover new opportunities and jobs.
Inside This Issue ✈️ How Google Is Scaling SAF Demand Through Shell, Amex GBT 💸 Sora Fuel Closes $14.6M Round To Scale Air-To-Jet Fuel Technology 📊 CCUS Investment Tops $5 Billion, But The IEA Say...
Inside This Issue ✈️ Megawatt Hydrogen Turboprop Engine Completes Maiden Flight in Central China 🤝 XCF Global and Axens North America Announce Commercial Collaboration for Vegan(r) Technology 🔌 Ma...
Inside This Issue ⚠️ Hydrogen's 4.9M-Tonne Shakeout: What's Still Being Built ⚡ Emerson and Strategic Biofuels to Deliver Renewable Carbon-Neutral Power to Louisiana 🔋 Plug Power Selected to Suppl...
Cowboy Clean Fuels And Absolute Climate Raise The Bar For High-Integrity Carbon Removal
The partnership brings ACS‑certified carbon removal credits to market through Evident’s C‑Capsule registry, giving buyers unprecedented transparency and confidence SAN FRANCISCO, April 08, 2026 (G...
Proposal submitted jointly with American Airlines, who will take delivery of and use eSAF from Project Atlas SACRAMENTO, Calif., April 8, 2026 /PRNewswire/ -- Infinium and the Sustainable Aviation...
Sora Fuel Closes $14.6M Round to Scale Air-to-Jet Fuel Technology
Breakthrough technology unlocks a scalable pathway to sustainable aviation fuel that is carbon-negative and price-competitive with fossil fuel BOSTON, April 8, 2026 /PRNewswire/ -- Sora Fuel, a cl...
Brazil's Second-Crop Corn Can Provide a Low-Carbon Pathway for Sustainable Aviation Fuel (SAF)
New research shows that expanding ethanol production from Brazil's second crop corn can support the growth of sustainable aviation fuel while limiting land-use change and greenhouse gas emissions. ...
Follow the money flow of climate, technology, and energy investments to uncover new opportunities and jobs.