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 🚢 Hyundai Pitches Hydrogen Transport Tied To Canada Submarine Bid 🧱 The LEGO Group Expands Its Portfolio Of Carbon Removal Solutions 🏆 SAF Pioneer LanzaJet Honored With RFA Indus...
Inside This Issue 🗜️ CarbonQuest Lands $4.1M Alberta Deal on Gas Compressors 🛡️ CADO, 123Carbon, and Assure SAF Registry Join Forces to Tackle SAF Integrity Gaps ✈️ ISCC, OMV, and Airbus Partner t...
Inside This Issue ⛏️ Iowa's Hydrogen Rush: Can Koloma Strike Gold Before Rules Kick In? ✈️ Bentley Commits to Use 100% Sustainable Aviation Fuel for Car Airfreight 🌬️ Minister Parrott Provides Upd...
CHIFENG, China, Feb. 27, 2026 /PRNewswire/ -- Envision Energy launched the first global shipment of green ammonia from Chifeng, Inner Mongolia to LOTTE Fine Chemical, a premier chemical company in ...
SAF Pioneer LanzaJet Honored With RFA Industry Award
Pioneering sustainable aviation fuel producer LanzaJet received the Renewable Fuels Association’s 2026 Industry Award at the National Ethanol Conference in Orlando this week. Last year the company ...
Houston Hosts World Hydrogen North America 2026 Industry Gathering
Hydrogen is one of the energy sources that has evolved the most when it comes to how developers plan and execute projects. The main reason for this is the advanced technology that has penetrated th...
Trump EPA Eyes Reallocating Waived Biofuel Obligations To Refiners: Report
The question of whether to reallocate those exempted blending obligations to larger refiners is a point of contention between the agriculture and fuel industries The Trump administration has settl...
Follow the money flow of climate, technology, and energy investments to uncover new opportunities and jobs.