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: 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-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.
Costs, scale, and timelines
- Cost ranges: Point-source capture at industrial sites may cost roughly tens to low hundreds of dollars per tonne, depending on concentration of CO2 and retrofit complexity. DAC today often costs several hundred dollars per tonne; many estimates expect costs to fall with scale, learning, and cheaper low-carbon energy.
- Scale gap: Climate models that rely heavily on negative emissions assume large-scale deployment of BECCS and DAC by midcentury. Achieving gigatonne-scale removal requires rapid and sustained investment in manufacturing, pipelines, storage sites, and renewables to power capture.
- Timing matters: Near-term emissions reductions through efficiency, electrification, and renewables deliver immediate climate benefits. Carbon capture is complementary but not a substitute for early and deep cuts.
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.
Trade-offs to accept and mitigate
- 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 a pragmatic tool when applied to specific problems: removing unavoidable process emissions, permanently storing residual CO2, and decarbonizing sectors with few alternatives. Its benefits are real but conditional on rigorous accounting, secure long-term storage, strong policy design, and prioritizing reductions first. Where capture becomes politically convenient or financially attractive to prop up fossil fuels, it distracts from the urgent transformations that cut emissions at source. Responsible deployment means choosing projects that maximize climate benefit, sequencing capture after aggressive mitigation, and building transparency and safeguards so that captured carbon truly advances rather than delays the transition to a low-carbon economy.
