Carbon capture represents not one technology or policy but a broad set of methods that extract carbon dioxide from flue gases or directly from the atmosphere and then either store it permanently underground, channel it into products, or inject it in ways that hold CO2 only for limited periods. Its value or harm depends on factors such as intent, timing, scale, governance, and economic viability. The following is a concise evaluation of the situations in which carbon capture serves as a useful instrument and those in which it poses risks of delay, inefficiency, or greenwashing.
How carbon capture can help
- Decarbonizing hard-to-abate industries: Sectors such as cement, steel, and chemicals, along with various high-temperature industrial activities, release CO2 as an inherent process output rather than from energy consumption. For many of these industries, capturing emissions directly at the source becomes one of the most feasible strategies for achieving net-zero goals.
- Removing residual emissions: Even after pushing energy efficiency, electrification, and fuel switching to their limits, some CO2 emissions persist. Technologies for permanent removal, including direct air capture and bioenergy with CCS, can counterbalance these remaining emissions and support net-negative outcomes when necessary to meet climate objectives.
- Enabling low-carbon fuels and hydrogen: When CO2 is captured from natural gas reforming and securely stored, it enables the production of lower-carbon hydrogen, commonly called blue hydrogen, serving as a transitional option while renewable-based green hydrogen capacity expands. This proves particularly valuable in situations where hydrogen demand rises quickly but renewable resources or electrolyzer availability remain constrained.
- Demonstrated successful storage cases: Active projects confirm that the technology works at scale. Norway’s Sleipner project, for example, has injected around 1 million tonnes of CO2 each year into a saline aquifer since the mid-1990s. Initiatives such as the Northern Lights facility, led by the UK and Norway, show that large-scale shared transport and storage networks can be developed successfully.
- When backed by robust policy and finance: Measures like carbon pricing, tax incentives, grants, and regulated emission cuts make these projects commercially realistic and ensure that captured CO2 represents additional reductions rather than replacing necessary mitigation. Effective policy design channels capture efforts to the places where they deliver the greatest climate gains.
How carbon capture becomes a distraction
- Delaying emissions reductions: Relying on capture as a promise to fix future emissions can allow continued investment in fossil infrastructure. Capture with weak safeguards can become an excuse to defer energy efficiency, electrification, or fuel switching.
- Subsidizing counterproductive fossil activity: When capture is coupled with enhanced oil recovery (EOR), captured CO2 can boost oil production. That creates a perverse result: more oil extracted and burned may outweigh the CO2 stored, especially if accounting is weak.
- High cost and limited near-term scale: Many capture approaches are expensive. Point-source capture costs vary widely but can be tens to low hundreds of dollars per tonne; direct air capture (DAC) costs have been hundreds of dollars per tonne at commercial demonstration scale. That makes capture a poor substitute for lower-cost emissions reductions in many sectors.
- Energy penalty and lifecycle emissions: Capture systems require energy. If that energy comes from fossil fuels, the net climate benefit shrinks. Capture can reduce plant efficiency by a significant fraction, increasing fuel use and operating costs.
- Questionable permanence and monitoring: Geological storage requires long-term monitoring to ensure CO2 remains sequestered. Projects with weak monitoring, unclear liability, or poor public engagement risk leakage concerns and community opposition.
- BECCS land-use and sustainability risks: Bioenergy with CCS (BECCS) can produce net-negative emissions on paper but may cause land-use change, biodiversity loss, food competition, and uncertain carbon accounting if biomass sourcing is not rigorously managed.
Illustrative cases and outcomes
- Sleipner (Norway): A long-standing case of effective offshore storage, where since 1996 roughly 1 million tonnes of CO2 per year have been injected into a saline formation, showcasing decades of secure containment and ongoing monitoring.
- Boundary Dam (Canada): A coal plant retrofit that captures about 1 million tonnes of CO2 annually, demonstrating that such upgrades can be technically achieved while also exposing substantial capital demands, operational hurdles, and the challenge of competing with more affordable low‑carbon options such as renewables.
- Petra Nova (USA): A project that captured more than a million tonnes per year from a coal facility but was paused due to economic pressures and low oil prices, underscoring how financial conditions and policy frameworks shape project longevity.
- Gorgon (Australia): A major industrial CCS development linked to natural gas processing that initially struggled to meet its storage goals and highlighted the operational and measurement difficulties inherent in large subsurface endeavors.
- Climeworks DAC plants (Iceland, Switzerland): Orca in Iceland and subsequent facilities illustrate that DAC functions reliably at modest scale, handling thousands to tens of thousands of tonnes per year, while cost and energy requirements remain the key obstacles to accelerating growth to the gigatonne range.
Expenses, scope, and schedules
- Cost ranges: Capturing CO2 directly at industrial facilities can run from several tens to the low hundreds of dollars per tonne, influenced by CO2 concentration levels and how complex the retrofit is. Current DAC operations often exceed a few hundred dollars per tonne, though many projections anticipate lower costs as deployment expands, expertise grows, and low-carbon energy becomes more affordable.
- Scale gap: Climate pathways that depend significantly on negative emissions envision expansive use of BECCS and DAC by midcentury. Reaching gigatonne-level removal demands swift, long-term commitments to build out manufacturing capacity, transport pipelines, suitable storage reservoirs, and renewable power to sustain capture systems.
- Timing matters: Cutting emissions now through efficiency upgrades, electrification, and renewable energy yields immediate climate gains. Carbon capture can reinforce these efforts but cannot replace the need for rapid and substantial early reductions.
Practical decision guide: determining the right moment to apply carbon capture
- Prioritize reductions first: Exhaust low-cost options—efficiency, electrification, material substitution—before relying on capture.
- Use capture where alternatives are limited: Favor industrial process emissions and chemical feedstocks where abatement options are scarce.
- Prefer permanent storage with strong monitoring: Ensure projects commit to verified, long-term geological storage with independent monitoring and clear liability rules.
- Avoid coupling with EOR unless strict accounting exists: When capture funds oil production, require transparent lifecycle accounting to ensure net climate benefit.
- Design policy to prevent delay: Condition subsidies on demonstrated reductions, time-limited support, and a clear pathway off fossil dependence.
- Safeguard land and supply chains for BECCS: Only deploy biomass-based capture with strict sustainability criteria to avoid negative biodiversity and food security impacts.
Policy and governance priorities
- Clear accounting rules: Precise and transparent systems for measurement, reporting, and verification (MRV) are vital to ensure captured CO2 is neither counted twice nor used to legitimize continued emissions.
- Long-term liability and monitoring: Governments and project sponsors must establish clear responsibility for overseeing stored CO2 across future decades and even centuries.
- Targeted incentives: Financial backing should prioritize initiatives that deliver the greatest climate gains per dollar and avoid reinforcing fossil-based infrastructure.
- Community engagement and social license: Local communities need to be consulted, kept informed, and fairly compensated whenever projects pose land-use impacts or potential safety concerns.
Compromises to acknowledge and address
- Infrastructure needs: Pipelines, shipping, storage sites and power for capture require time and capital; planning should consider cumulative demand and shared hubs to reduce cost.
- Energy supply: Capture systems must be powered by low-carbon energy to preserve climate benefits. Otherwise, net emissions reductions are lower or reversed.
- Risk of capture reliance: Policymakers must balance investment between capture and faster, cheaper emissions reductions to avoid expensive lock-in.
Carbon capture is presented as a practical instrument for targeted challenges, such as managing unavoidable process emissions, ensuring permanent storage of remaining CO2, and supporting decarbonization in sectors with limited alternatives. Its advantages are genuine, yet they rely on strict accounting, reliable long-term storage, robust policy frameworks, and a clear priority on cutting emissions first. When capture is used because it is politically expedient or financially profitable for extending fossil fuel operations, it diverts attention from the transformative measures needed to reduce emissions at their origin. Responsible use involves selecting projects that deliver the greatest climate gains, applying capture only after substantial mitigation efforts, and establishing transparency and safeguards to ensure that captured carbon genuinely contributes to, rather than slows down, the shift toward a low-carbon economy.
