As global carbon dioxide emissions continue to stress climate systems, the imperative to move beyond mere reduction and toward active removal and transformation of CO₂ has never been more urgent. Carbon capture and carbon utilization (CCU) represent two complementary strategies that together offer a path not only to mitigate emissions but to convert a waste stream into a feedstock for goods we use every day. By integrating capture technologies with innovative conversion processes, scientists and companies are beginning to unlock the economic and environmental potential of CO₂—turning a pollutant into an asset. This article explores how these technologies work, the products they enable, the benefits of a combined approach, and the hurdles that remain on the road to commercialization.

The Science Behind Carbon Capture

Carbon capture is the process of trapping CO₂ before it enters the atmosphere. The three main approaches are post‑combustion capture, pre‑combustion capture, and direct air capture (DAC).

Post‑combustion capture is the most mature method. It involves scrubbing flue gas from power plants and industrial facilities using chemical solvents such as amines. After absorption, the CO₂ is released by heating, yielding a concentrated stream suitable for storage or utilization. While effective, this process requires significant energy to regenerate the solvent, which can reduce overall plant efficiency.

Pre‑combustion capture is used primarily in gasification or reforming processes. Fossil fuels are reacted with steam and oxygen to produce syngas—a mixture of hydrogen and carbon monoxide. The carbon monoxide is then converted to CO₂ through a water‑gas shift reaction, and the resulting hydrogen can be burned cleanly while the CO₂ is captured before combustion. This approach is often more efficient but is limited to facilities designed for gasification.

Direct air capture draws ambient air over chemical sorbents or liquid solvents that bind CO₂. When heated, the sorbent releases pure CO₂. DAC is location‑independent and can address diffuse emissions, but it is currently more expensive—ranging between $100 and $600 per tonne of CO₂—due to the very low concentration of CO₂ in air (approximately 420 ppm). Companies like Climeworks and Carbon Engineering are scaling up DAC plants, and the International Energy Agency (IEA) projects that DAC could play a significant role in reaching net‑zero targets, though it remains nascent.

Transforming CO₂ into Valuable Products

Once CO₂ is captured, it can be converted into a wide range of products. Rather than storing the gas underground, utilization creates economic value that can offset capture costs and incentivize further deployment. The conversion relies on two main pathways: direct use (e.g., in carbonated beverages or as a solvent) and chemical transformation (e.g., reduction to fuels, polymers, or building materials). Below we explore the most promising product categories.

Fuels and Chemicals

Electrocatalytic and thermochemical routes can reduce CO₂ to carbon monoxide, methane, methanol, or synthetic hydrocarbons. Methanol, for instance, is a versatile platform chemical used in fuel cells, as a gasoline blend, and as a precursor for olefins. Companies such as Carbon Recycling International operate commercial plants that convert captured CO₂ and renewable hydrogen into methanol, supplying markets in Iceland and beyond. LanzaTech uses a proprietary gas‑fermentation process where microbes consume CO‑rich industrial gases (including CO₂) to produce ethanol, which can then be upgraded to jet fuel or plastics. The U.S. Department of Energy’s Carbon Utilization Program funds multiple projects aimed at lowering the cost and energy intensity of these conversions. While fuels made from CO₂ are currently more expensive than fossil‑derived alternatives, declining renewable electricity prices could make them competitive in the coming decade.

Building Materials

Carbon mineralization—where CO₂ reacts with calcium or magnesium‑bearing minerals to form stable carbonates—offers a permanent storage solution while producing construction materials. CarbonCure injects captured CO₂ into concrete during mixing, where it mineralizes and strengthens the concrete, allowing producers to reduce the cement content and lower the overall carbon footprint. Over 700 concrete plants globally use CarbonCure’s technology, and the company reports that each cubic yard of concrete can sequester about 10‑15 kg of CO₂. Solidia Technologies (now part of Solidia) cures concrete with CO₂ instead of water, shortening curing times and achieving a net‑negative carbon footprint when combined with supplementary cementitious materials. These approaches not only lock away CO₂ permanently but also reduce the enormous emissions from cement manufacturing—which accounts for roughly 8% of global CO₂ emissions.

Plastics and Polymers

CO₂ can be copolymerized with epoxides to produce polycarbonates and polyols, key ingredients in flexible foams, coatings, and adhesives. Covestro has commercialized a process using CO₂ to replace up to 20% of the petroleum‑based feedstock in polyurethane foams, marketed under the “cardyon®” brand. Similarly, Newlight Technologies uses a biocatalyst to convert captured methane and CO₂ into polyhydroxyalkanoate (PHA) bioplastics, which are fully biodegradable. These innovations demonstrate that CO₂ can serve as a building block for high‑performance materials, reducing reliance on fossil feedstocks and lowering the carbon footprint of the plastics industry.

Agriculture and Food Products

Direct use of CO₂ in greenhouses to enhance plant growth is a well‑established practice. Enriching greenhouse atmospheres with CO₂ increases photosynthesis rates and crop yields by up to 30%. Carbon Clean and other companies supply purified CO₂ for this purpose. Additionally, CO₂ can be converted into urea fertilizers through conventional ammonia‑urea processes, though the net climate benefit depends on the source of hydrogen. Emerging research explores electrochemical conversion of CO₂ into formic acid (used as a preservative) and protein‑rich feed for aquaculture. While these markets are smaller than fuels or materials, they represent important niches that can be served with modest amounts of captured CO₂.

The Benefits of an Integrated CCU Strategy

Linking carbon capture directly to utilization creates a closed‑loop system that reduces the net CO₂ released to the atmosphere while generating revenue. The key benefits include:

  • Emissions reduction: Every tonne of CO₂ that is utilized instead of emitted avoids one tonne of atmospheric loading. When combined with carbon‑free energy for conversion, the overall carbon footprint can become net‑negative.
  • Economic value creation: CCU products—from e‑fuels to concrete—can command green premiums or benefit from carbon credits, creating new markets and jobs. The global CCU market is projected to reach $240 billion by 2030 according to some analyses.
  • Circular carbon economy: By treating CO₂ as a resource rather than a waste, CCU aligns with circular economy principles. Carbon atoms are kept in the economy through repeated use, reducing the need for new fossil extraction.
  • Technological innovation: The race to lower the cost of conversion is driving breakthroughs in electrocatalysis, synthetic biology, and process engineering, with spillover benefits for clean energy storage and green chemistry.

Importantly, CCU can complement carbon capture and storage (CCS) rather than compete with it. While CCS is essential for baseload emissions from power plants and hard‑to‑abate industries like cement and steel, CCU offers a path for sectors where storage is not readily available or where a product can replace a high‑carbon incumbent. The Intergovernmental Panel on Climate Change (IPCC) emphasizes that both approaches are needed to meet the Paris Agreement goals.

Overcoming Challenges

Despite its promise, the intersection of capture and utilization faces significant technical, economic, and policy hurdles.

Cost and Energy Requirements

Capturing CO₂ from dilute sources like cement kilns or the air is energy‑intensive and costly. Current capture costs range from $40–$120 per tonne for point‑source capture and $100–$600 per tonne for DAC. Conversion adds another layer of expense: thermochemical and electrochemical processes require large inputs of high‑temperature heat or electricity, and catalyst lifetimes are often limited. For CCU to become commercially viable at scale, the cost of renewable electricity must continue to fall, and catalyst efficiency must improve. A 2022 report by the IEA notes that CCU projects represent less than 1% of total global CO₂ capture capacity today, largely because utilization is not yet profitable without substantial subsidies.

Scalability and Storage vs. Utilization

The volume of CO₂ that can be utilized is dwarfed by the amount emitted. For example, global CO₂ emissions are roughly 36 billion tonnes per year, while total potential utilization is estimated at only 1–2 billion tonnes annually (for products like concrete, chemicals, and fuels). This means utilization alone cannot solve the climate problem—it must be paired with permanent storage for the vast majority of captured CO₂. Additionally, many utilization pathways (e.g., fuels) release the CO₂ again when combusted, offering only a temporary delay unless the fuel is used in a system with recapture. Therefore, the net benefit of CCU depends on the lifetime of the product and the source of the energy used in conversion.

Policy and Market Frameworks

Supportive policies are crucial. The U.S. 45Q tax credit offers up to $85 per tonne for DAC‑based CO₂ storage and up to $60 per tonne for enhanced oil recovery or utilization. The European Union’s Innovation Fund and national carbon contracts for difference provide similar incentives. However, many CCU products lack clear carbon accounting rules—should a fuel made from CO₂ be considered carbon‑neutral? Standardised life‑cycle assessment methodologies are needed to ensure that claims are transparent and consistent. Without robust regulation, the risk of “greenwashing” remains high.

Future Outlook

The intersection of carbon capture and utilization is still in its early days, but momentum is building. More than 40 commercial‑scale CCU facilities are in operation or under construction globally, with investments exceeding $10 billion. Pilot projects are demonstrating ever‑more efficient conversion routes, from electrochemical CO₂ reduction to direct solar‑driven processes. The falling cost of renewable electricity—which has dropped over 80% for solar and 60% for wind in the last decade—is the single biggest factor that could make CCU economical. Meanwhile, corporate net‑zero commitments are creating demand for low‑carbon products, and carbon markets are beginning to price CO₂ removal.

In the next five to ten years, we can expect large‑scale DAC‑to‑fuel plants, expanded use of CO₂‑based concrete in infrastructure, and commercial‑scale production of CO₂‑derived polymers. The key will be to de‑risk the technologies through public‑private partnerships and to develop the infrastructure—pipelines, storage sites, and distribution networks—that connect capture sites to utilization markets. The CCU industry also needs a workforce trained in green chemistry, process engineering, and carbon accounting.

Ultimately, turning CO₂ into valuable products is not a silver bullet for climate change, but it is a powerful tool in the broader decarbonisation toolbox. It aligns economic incentives with environmental goals, fosters innovation, and creates a tangible bridge between the fossil‑fuel‑based economy of today and a circular, low‑carbon future. The journey from pollutant to product is complex, but the potential reward—a climate‑stable world built on reused carbon—is worth the effort.