Embodied Carbon Footprint

The embodied carbon footprint, also referred to as embedded carbon or “embodied carbon”, includes all GHG emissions generated during raw material extraction, production, and distribution phases up to the factory gate (Cradle-to-Gate). It does not include emissions from the use phase or end-of-life, which distinguishes it from Cradle-to-Grave carbon footprints.

Strategic importance in decarbonisation

Buildings: According to UNE-EN 15978, up to 50% of total emissions in nearly zero-energy buildings come from the embodied carbon of materials such as steel, cement, and glass.

Infrastructure: Roads and bridges can concentrate up to 70% of their total emissions before the use phase.

Consumer products: Smartphones generate around 64% of their total carbon footprint before being switched on for the first time.

Calculation methodology

1. Define the functional unit (e.g. 1 m² of panel, 1 tonne of steel).
2. System boundary: Cradle-to-Gate or Cradle-to-Site.
3. Life Cycle Inventory (LCI): collect data on energy, materials, and transport (databases such as ecoinvent v3.9, GaBi, ICE v3).
4. Co-product allocation: based on mass, energy, or economic value.
5. Apply emission factors (IPCC AR6, GWP100) to obtain kg CO₂e.
6. Verification: ISO 14067 or EN 15804+A2 (EPD).

Key indicators

• kg CO₂e per functional unit
• Carbon intensity: kg CO₂e/MJ or kg CO₂e/€ of revenue
• Percentage reduction versus baseline or sector benchmark
• Recycled content (%) as a reduction lever

Reduction strategies

• Low-carbon materials: reduced-clinker cement (LC3/FLC3) or electric steel with 80% scrap content.
• Renewable process energy: electric kilns, green hydrogen.
• Design optimisation: structural lightweighting, prefabricated modules.
• Circular economy: material reuse and life extension (design for disassembly).
• Temporary offsetting: carbon removal credits while CCUS technologies mature.

Regulatory framework and standards

• ESPR Regulation: will require reporting of embodied CO₂ and recycled content for priority products.
• LEED v4/v5, BREEAM: credits for achieving at least a 10% reduction in embodied carbon versus reference values.
• CBAM: border adjustment for steel and cement based on embodied emissions.
• ISO 14068: product climate neutrality will require ≥ 90% reduction in embodied carbon before offsetting.

Case study: Low-carbon concrete structure (2024)

Baseline: Concrete CEM I 42.5 R (95% clinker) → 370 kg CO₂e/m³

Intervention: Replacement of 40% of clinker with fly ash plus LC3 additive.

Result: Carbon footprint reduced to 220 kg CO₂e/m³ (-41%), Type III EPD certification, and €5/tonne savings under CBAM charges.

Co-benefit: 5% increase in compressive strength and reduced heat of hydration.

Digital tools

• One Click LCA and Tally for embodied carbon calculation in construction.
• SimaPro and OpenLCA for industrial product modelling.
• BIM with LCA plug-ins to integrate data in early-stage design.

Relationship with other concepts

• Life Cycle Inventory (LCI): data collection phase.
• Use-phase carbon footprint and end-of-life carbon footprint complete the full emissions profile.
• Digital Product Passport (DPP) will disclose unit embodied carbon.
• FDI and WDI help contextualise emission outsourcing along global value chains.

Embodied carbon has become a core pillar of industrial decarbonisation. Reducing it requires material innovation, process electrification, circular economy strategies, and transparency through EPDs and Digital Product Passports. Companies that address embodied carbon proactively anticipate regulation, unlock green finance, and strengthen their competitiveness in net-zero markets.