Every year, humanity emits approximately 37 billion tonnes of CO₂ into the atmosphere. This carbon, released by burning fossil fuels, is driving climate change at a pace unprecedented in Earth's recent geological history. The concentration of atmospheric CO₂ has risen from 280 parts per million in pre-industrial times to over 420 ppm today—higher than any time in the last 3 million years.
This is where carbon capture technology enters the story. Can we literally pull CO₂ from the air or capture it from power stations before it escapes, then store or use it? The technology exists and works. The question is whether it can scale fast enough and cheaply enough to make a meaningful difference.
Three Approaches to Carbon Capture
Point-Source Capture removes CO₂ from concentrated sources like power plants and industrial facilities before it enters the atmosphere. This is the most mature carbon capture technology. Power station exhaust contains 10-15% CO₂—much higher than atmospheric concentration—making capture more efficient.
Chemical solvents (often amines) absorb CO₂ from flue gases. The CO₂-rich solvent is then heated, releasing pure CO₂ that can be compressed and stored. The regenerated solvent returns to capture more CO₂. This technology works and is deployed at scale in several facilities—the Boundary Dam power station in Canada captures over 1 million tonnes of CO₂ annually.
Direct Air Capture (DAC) removes CO₂ directly from ambient air. This is technically harder because atmospheric CO₂ is only 0.04%—300 times more dilute than power plant exhaust. DAC requires moving enormous volumes of air through chemical filters.
Current DAC plants use solid sorbents or liquid solvents that chemically bind CO₂. Once saturated, the sorbent is heated to 100-150°C, releasing concentrated CO₂. Climeworks operates DAC facilities in Iceland and Switzerland. The Icelandic facility captures 4,000 tonnes annually—impressive but tiny compared to global emissions.
Natural Carbon Capture harnesses biological and geological processes. Forests, soils, and oceans naturally absorb CO₂. Reforestation and afforestation (creating new forests) remove CO₂ whilst providing habitat. Soil carbon sequestration through regenerative agriculture stores carbon in soil organic matter. Ocean-based approaches include cultivating kelp forests or enhancing oceanic alkalinity.
These natural solutions are often cheaper and provide co-benefits—biodiversity, soil health, coastal protection. But they have limits: available land, saturation points, and permanence concerns (forests can burn, releasing carbon back).
Where Does the Captured Carbon Go?
Capturing CO₂ is only half the challenge. Permanent storage or productive use is essential.
Geological Storage injects compressed CO₂ deep underground into porous rock formations, typically depleted oil and gas fields or deep saline aquifers. The CO₂ is trapped by impermeable rock layers above. Over time, it may mineralize—reacting with rock to form solid carbonate minerals. Norway's Sleipner project has stored over 20 million tonnes since 1996, demonstrating long-term viability.
Carbon Utilization converts captured CO₂ into useful products: synthetic fuels, chemicals, building materials, or feedstock for industrial processes. Carbfix in Iceland mineralizes CO₂ by reacting it with basalt rock, forming stable carbonate minerals in under two years. Other companies produce carbon-neutral aviation fuel or concrete that incorporates CO₂.
However, many utilization pathways only store carbon temporarily—fuels are burned, releasing CO₂ again. Only permanent products (minerals, construction materials with century-long lifespans) count as genuine long-term removal.
The Economics Challenge
Carbon capture is expensive. Point-source capture costs roughly £40-80 per tonne of CO₂. Direct air capture currently costs £400-600 per tonne. For context, the EU carbon price recently reached £75/tonne—economically viable for point-source capture but far below DAC costs.
Several factors could reduce costs: technological innovation (more efficient sorbents, lower energy requirements), economies of scale (mass production of standardized units), cheaper renewable energy (capturing CO₂ is energy-intensive), and higher carbon prices making capture economically competitive.
Proponents argue that costs will fall dramatically as deployment scales—similar to solar panels, which dropped 90% in cost over a decade. Skeptics note that carbon capture is fundamentally more complex than solar panels and may have a higher cost floor.
Britain's Carbon Capture Strategy
The UK government committed £20 billion to carbon capture deployment by 2030, targeting 20-30 million tonnes annual capture capacity by 2030. Two industrial clusters—Teesside and Merseyside—are being developed as "carbon capture hubs" with shared CO₂ transport and storage infrastructure.
The North Sea offers significant geological storage potential—depleted oil and gas fields and deep saline aquifers could store centuries worth of UK emissions. The Acorn project in Scotland will capture CO₂ from the St Fergus gas terminal and store it under the North Sea.
Drax power station in Yorkshire is developing bioenergy with carbon capture (BECCS)—burning biomass (which absorbed CO₂ while growing) and capturing the CO₂ from combustion, creating "negative emissions." The logic: the biomass removed CO₂ from the atmosphere; capturing it from combustion prevents re-release, achieving net removal.
Critics argue this £20 billion should fund renewable energy rather than extending fossil fuel infrastructure's life. Proponents counter that carbon capture is essential for "hard-to-decarbonize" sectors like cement, steel, and aviation where alternative technologies aren't yet viable.
The Reality: Necessary But Not Sufficient
Carbon capture is not a silver bullet but one tool among many needed for climate action. The numbers are sobering: current global carbon capture capacity is about 40 million tonnes annually. Global emissions are 37,000 million tonnes annually—nearly 1,000 times larger. Even aggressive scaling projections suggest carbon capture might remove 5-10% of current emissions by 2050.
The priority remains reducing emissions: transitioning to renewable energy, electrifying transport, improving efficiency, changing consumption patterns. Carbon capture addresses residual emissions from sectors where alternatives are limited and potentially enables "negative emissions" to reverse historical accumulation.
The technology works. The question is political will, economic viability, and speed of deployment. Climate models that limit warming to 1.5°C nearly all include significant carbon removal—we've delayed action so long that emissions reductions alone won't suffice. We need to remove CO₂ we've already emitted whilst drastically cutting new emissions.
Whether carbon capture scales to meaningful climate impact remains uncertain. What's certain is that without it—and without rapid emissions reductions—the challenge becomes insurmountable. The atmosphere doesn't negotiate, and carbon accumulates. Every tonne captured matters, and every year we delay, the challenge grows harder.
