Cement emissions can be reduced without carbon capture by using less cement, lowering the share of clinker in cement, changing raw materials or binders, improving plant energy efficiency, and switching to lower-emissions fuels. These measures do not all solve the same problem: fuel and efficiency measures cut energy-related emissions, while material changes can reduce emissions tied to making clinker. Conventional clinker production releases process CO2 when limestone is converted, so changing the kiln’s energy source alone cannot eliminate that source.
Why cement emissions need more than an energy fix
Making cement emits CO2 from two broad sources: the heat and electricity used in production, and the chemical reaction that turns limestone into clinker, the main ingredient in ordinary Portland cement. That distinction matters when comparing alternatives to carbon capture. A more efficient kiln or a lower-emissions fuel can reduce energy-related emissions, but conventional limestone-based clinker production still releases process CO2.
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The International Energy Agency (IEA) identifies energy and material efficiency and lower-emissions fuels as near-term measures. Deeper cuts also require changes to raw materials and other innovative options. IEA: Cement
Which alternatives reduce cement emissions?
| Approach | Emissions it targets | What it involves | Key constraint |
|---|---|---|---|
| Material efficiency and demand reduction | Avoids emissions from cement and concrete production that would otherwise be needed | Design structures and use materials efficiently so a project delivers the required service with less cement or concrete. | It is a design and system-level strategy, not a change to kiln chemistry. The sources do not establish a universal reduction figure. |
| Lower clinker content | Reduces emissions associated with clinker production, including process and energy emissions | Replace part of the clinker with suitable supplementary cementitious materials (SCMs) or other constituents. | Material supply, product performance, standards, and procurement rules affect what can be used and at what scale. |
| Alternative raw materials, including calcined clay | Can reduce reliance on conventional limestone-based clinker production | Use alternative raw-material pathways such as calcined clay in cement production. | This does not mean process emissions are eliminated across all cement production. |
| Plant energy efficiency | Energy-related emissions | Improve kiln and plant operations to reduce energy use per tonne of clinker or cement. | It does not remove process CO2 from limestone chemistry. |
| Lower-emissions fuels | Emissions from kiln heat, depending on the fuel and how its emissions are accounted for | Use options such as bioenergy, hydrogen, electricity, or other alternative fuels where suitable. | Fuel availability, emissions intensity, and plant configuration matter; process emissions persist. |
| Alternative binders | May avoid substantial conventional process emissions | Use binding agents with different chemistry and material inputs from ordinary Portland cement. | Readiness and scale vary; some options remain in research and development and are not interchangeable with conventional cement in every use. |
Why reducing clinker is a central lever
Clinker is the emissions-intensive component that links cement demand to both kiln energy and limestone process emissions. Replacing some clinker with suitable SCMs or other constituents can reduce the amount of clinker that must be produced for a given amount of cement. The IEA says standards and procurement changes can help facilitate SCM use, while the practical choice still depends on local supply and the performance requirements of the application. IEA: Breakthrough Agenda Report 2025 IEA: Technology Roadmap: Low-Carbon Transition in the Cement Industry
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In its 2023 net-zero pathway, the IEA lists a clinker-to-cement ratio of 0.71 in 2022, falling to 0.65 in 2030, 0.61 in 2035, and 0.57 in 2050. These are scenario milestones, not predictions or a guarantee that every region can reach the same values. IEA: Cement
What efficiency and fuel switching can—and cannot—do
Efficiency improvements reduce the energy needed to make clinker. The IEA’s 2023 pathway lists kiln thermal energy intensity at 3.6 GJ per tonne of clinker in 2022, 3.4 in 2030, 3.3 in 2035, and 2.9 in 2050. These figures are pathway values, not observed outcomes for every plant. IEA: Cement
Changing the heat source can further cut energy-related emissions. The same IEA pathway lists low-emissions fuels as 5% of thermal energy use in 2022, 30% in 2030, 49% in 2035, and 86% in 2050. The American Cement Association’s January 2024 U.S. roadmap also includes alternative fuels and efficiency among its actions. Neither pathway figure nor roadmap implies that every plant has the same fuel options: supply and facility configuration matter. IEA: Cement American Cement Association: Roadmap to Carbon Neutrality
Even a kiln powered by electricity or bioenergy still has process emissions if it makes clinker through conventional limestone chemistry. That is why efficiency and fuel switching are important but cannot, on their own, deliver a zero-process-emissions route.
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How to compare the options for a project or region
No single substitute fits every cement plant or construction use. A practical comparison should ask:
- Which emissions source changes? Efficiency and fuels primarily address energy emissions; clinker reduction can reduce both energy and process emissions associated with clinker production; alternative binders may avoid substantial conventional process emissions.
- Are the materials or fuels available locally? Availability differs by region and can limit uptake.
- Does the cement meet the application’s performance requirements? The appropriate blend depends on product performance and applicable standards.
- Do procurement rules permit the option? Standards and purchasing requirements can either enable or constrain lower-clinker products.
- Are cost figures like-for-like? A cost estimate for one pathway should not be presented as the cost of another.
The IEA’s 2025 report estimates that early commercial near-zero cement plants using carbon capture and storage (CCS) cost 75–150% more to produce than conventional plants, varying by region. That estimate concerns CCS plants; it is not a cost estimate for clinker substitution, efficiency, fuel switching, or alternative binders. IEA: Breakthrough Agenda Report 2025
What is established—and what depends on local conditions
The broad set of non-capture options is clear: reduce demand for cement through material efficiency, lower clinker content, change raw materials or binders, improve plant energy performance, and use lower-emissions fuels. Their relative contribution at a particular plant or in a particular market is not established by one universal figure. The sources do not provide country-specific material availability, plant-level abatement costs, or comparable life-cycle reductions for each option. Claims about a specific project therefore need local evidence on materials, fuel supply, standards, and the intended use of the cement.
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