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 make a difference
- Decarbonizing hard-to-abate industries: Cement, steel, chemicals, and some high-temperature industrial processes emit CO2 as a process byproduct rather than from energy use. Capturing these point-source emissions is often one of the most practical ways to reach net-zero for those sectors.
- Removing residual emissions: After maximal energy efficiency, electrification, and fuel switching, some residual CO2 emissions remain. Permanent removal technologies (direct air capture, bioenergy with CCS) can offset those hard-to-eliminate residuals and enable net-negative emissions where needed to meet climate targets.
- Enabling low-carbon fuels and hydrogen: Capturing CO2 from natural gas reforming combined with storage can produce lower-carbon hydrogen (so-called blue hydrogen) as a transitional supply while renewable-based hydrogen (green hydrogen) scales up. This is helpful when hydrogen demand is urgent and renewables or electrolyzer capacity are limited.
- Demonstrated successful storage cases: Operational projects show technical feasibility. Norway’s Sleipner project has stored roughly 1 million tonnes of CO2 per year in a saline aquifer since the mid-1990s. Projects like the UK and Norway-led Northern Lights facility demonstrate shared transport and storage infrastructure can be built at scale.
- When backed by robust policy and finance: Carbon pricing, tax credits, grants, and regulated emissions reductions make projects viable and ensure capture is additional to—not a substitute for—emissions cuts. Well-designed incentives direct capture where it achieves the most climate benefit.
How carbon capture distracts
- Delaying emissions reductions: Leaning on capture as a future fix can justify ongoing investment in fossil assets. When safeguards are weak, capture may serve as a rationale to postpone energy efficiency upgrades, electrification, or shifting to alternative fuels.
- Subsidizing counterproductive fossil activity: Pairing capture with enhanced oil recovery (EOR) allows injected CO2 to increase oil output. This can lead to a counterintuitive outcome in which the additional extracted and burned oil surpasses the amount of CO2 securely stored, particularly under lax accounting.
- High cost and limited near-term scale: Numerous capture technologies remain costly. Point-source capture prices range widely but often fall between tens and low hundreds of dollars per tonne, while commercial-scale direct air capture (DAC) has reached several hundred dollars per tonne. As a result, capture frequently cannot compete with more economical emissions‑reduction strategies across many industries.
- Energy penalty and lifecycle emissions: Capture infrastructure consumes substantial energy, and when that energy is supplied by fossil fuels, the overall climate benefit declines. This dependency can noticeably lower plant efficiency, raising both fuel consumption and operating expenses.
- Questionable permanence and monitoring: Geological storage demands long-term oversight to confirm CO2 remains contained. Insufficient monitoring, ambiguous responsibility, or inadequate community engagement can heighten fears of leakage and provoke local resistance.
- BECCS land-use and sustainability risks: Bioenergy with CCS (BECCS) may appear to deliver net-negative emissions, yet it can also trigger land-use shifts, biodiversity impacts, food‑supply pressures, and unreliable carbon accounting when biomass sourcing is not tightly controlled.
Representative examples and their results
- Sleipner (Norway): A long-running example of successful offshore storage. Since 1996, Sleipner has injected roughly 1 million tonnes of CO2 per year into a saline formation, demonstrating secure storage and continuous monitoring for decades.
- Boundary Dam (Canada): A coal power retrofit capturing around 1 million tonnes CO2 annually. It proved retrofits are technically possible but highlighted high capital costs, operational complexity, and the difficulty of competing with cheaper low-carbon alternatives like renewables.
- Petra Nova (USA): Captured over a million tonnes per year from a coal plant but was idled amid economic pressures and low oil prices; it illustrated how project economics and policy support determine longevity.
- Gorgon (Australia): A large industrial CCS project tied to natural gas processing that initially failed to meet storage targets and revealed the operational and measurement challenges in large subsurface projects.
- Climeworks DAC plants (Iceland, Switzerland): Orca in Iceland and follow-on plants show that DAC works technically at small scale (thousands to tens of thousands of tonnes per year). Cost and energy supply are the major barriers to scaling to the gigatonne level quickly.
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 framework: when to use carbon capture
- Prioritize reductions first: Tap into the most affordable measures—boost efficiency, shift to electrification, and substitute materials—before turning to capture.
- Use capture where alternatives are limited: Give preference to industrial process emissions and chemical feedstocks when few viable abatement choices exist.
- Prefer permanent storage with strong monitoring: Require projects to commit to verified, long-duration geological storage supported by independent oversight and well-defined liability rules.
- Avoid coupling with EOR unless strict accounting exists: If capture supports oil production, demand transparent, full‑lifecycle accounting to guarantee a genuine climate benefit.
- Design policy to prevent delay: Tie subsidies to proven emissions cuts, temporary support windows, and a clear route away from fossil reliance.
- Safeguard land and supply chains for BECCS: Deploy biomass-based capture only under rigorous sustainability standards to prevent harm to biodiversity and food security.
Policy and governance priorities
- Clear accounting rules: Rigorous, transparent measurement, reporting, and verification (MRV) are essential so captured CO2 is not double-counted or used to justify ongoing emissions.
- Long-term liability and monitoring: Governments and project sponsors must clarify who is responsible for stored CO2 over decades and centuries.
- Targeted incentives: Financial support should favor projects that deliver maximum climate benefit per dollar and that do not lock in fossil infrastructure.
- Community engagement and social license: Local communities must be consulted, informed, and compensated where projects carry land-use or safety risks.
Compromises to acknowledge and address
- Infrastructure needs: Pipelines, transport routes, storage facilities, and the energy required for capture demand both time and significant funding, so planning should reflect overall future demand and encourage shared hubs to lower expenses.
- Energy supply: Capture operations have to rely on low-carbon power to maintain their climate advantages; without it, overall emissions cuts diminish or may even be undone.
- Risk of capture reliance: Policymakers need to weigh funding for capture against quicker and more economical emission reduction options to prevent costly long-term dependency.
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.
