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 💧 Ebb Partners with Saudi Water Authority to Transform Desalination Brine into Megaton-Scale CO₂ Removal 🏭 CO280 Successfully Completes Carbon Capture Field Pilot at a U.S. Pulp ...
Inside This Issue ⚗️ Air Liquide's Ammonia Cracker Unlocks Hydrogen Trade 🤝 BASF and ExxonMobil Join Forces to Advance Low - Emission Hydrogen Through Methane Pyrolysis Technology 🔥 Haffner Energy...
Inside This Issue ⛽ Texas Bypasses EPA, Unlocks Billion-Dollar CCS Rush 🏭 Proposed Blue Ammonia Plant In Ingleside Moves Forward After Heated Debate 💡 Hydrogen Could Be The Secret To Unlimited Ene...
James B. Hartwell Agrees to Join Canadian Biogas Investments Inc. as President and CEO
CALGARY, AB, Nov. 19, 2025 /CNW/ - Canadian Biogas Investments Inc. ("CBI"), a Calgary-based developer of dry fermentation anaerobic digestion projects, is pleased to announce that investment execu...
XCF Global Welcomes Growing Momentum for Sustainable Aviation Fuel Adoption in the United States
Policy Momentum: Federal and State Policy Alignment Is Accelerating Nationwide SAF Adoption Policy Momentum: Federal and state policy alignment is accelerating nationwide SAF adoption Market Oppor...
YOAKUM COUNTY, TEXAS Return Carbon, a leading project development and investment company in carbon markets, in collaboration with the Permian Energy Development Lab (PEDL), is proud to announce the...
BGN Announces Strategic MOU with XCF Global to produce and supply Sustainable Aviation Fuel
BGN and XCF Global Sign MOU to Develop Global Production, Distribution and Logistics Infrastructure for SAF and Other Renewable Fuels BGN joins International Air Transport Association (IATA) as st...
Follow the money flow of climate, technology, and energy investments to uncover new opportunities and jobs.