The Difference Between PCF and LCA: A Single Number or a Framework?

The Difference Between PCF and LCA: A Single Number or a Framework?

PCF and LCA often appear together at the same table. Because both talk about product environmental impact. But they are not the same thing. Understanding the difference between these two methodologies is the foundation for choosing the right tool for the right purpose. Wrong methodology selection leads to outcomes such as unnecessary costs, incomplete information, or failure to meet stakeholder expectations.

In this article, we cover the differences between PCF and LCA in detail, explaining the standard framework of each, their impact categories, use cases, and practical decision criteria.

Standard frameworks

ISO 14040 and ISO 14044: The foundation of LCA

LCA (Life Cycle Assessment) is defined by ISO 14040 and ISO 14044 standards. ISO 14040 establishes the principles and framework of LCA. ISO 14044 provides the requirements and implementation guidance.

The four phases of LCA:

1. Goal and scope definition: The purpose of the study, target audience, system boundaries, and functional unit are determined.
2. Inventory analysis (LCI): All inputs (energy, materials, water) and outputs (emissions, waste) are quantified.
3. Impact assessment (LCIA): Inventory data is converted to environmental impact categories.
4. Interpretation: Results are analyzed, sensitivity assessment is performed, recommendations are presented.

This structure enables systematic evaluation of multiple environmental impacts.

ISO 14067: The PCF standard

PCF (Product Carbon Footprint) is defined by ISO 14067 standard. ISO 14067 builds on the principles of ISO 14040/14044 but focuses only on climate change impact.

Key features of ISO 14067:

• Covers only greenhouse gas emissions
• CO2 equivalent is calculated based on global warming potential (GWP)
• Cradle-to-gate or cradle-to-grave boundaries can be used
• Result is typically expressed in kg CO2e
• Contains special rules for carbon removal and biogenic carbon

PCF (Product Carbon Footprint)

PCF measures the climate impact of a product. The result is usually expressed as a single number: X kg CO2e. The focus is greenhouse gas emissions.

Scope of PCF

All greenhouse gases are evaluated in PCF calculation:

• Carbon dioxide (CO2)
• Methane (CH4)
• Nitrous oxide (N2O)
• Hydrofluorocarbons (HFCs)
• Perfluorocarbons (PFCs)
• Sulfur hexafluoride (SF6)
• Nitrogen trifluoride (NF3)

These gases are converted to CO2 equivalent using 100-year global warming potential (GWP100). IPCC values are used as reference.

LCA (Life Cycle Assessment)

LCA evaluates all environmental impacts of a product. Climate impact (global warming potential) is just one of them.

LCA impact categories

Global warming potential (GWP): Contribution of greenhouse gas emissions to climate change. Expressed as kg CO2 equivalent. Same scope as PCF.

Acidification (AP): Potential of emissions such as SO2, NOx, and NH3 to acidify soil and water. Expressed as kg SO2 equivalent. Related to acid rain and soil degradation.

Eutrophication (EP): Potential of nitrogen and phosphorus compounds to cause excessive nutrient loading in water bodies. Expressed as kg PO4 equivalent or kg N equivalent. Related to algal blooms and oxygen depletion in water bodies.

Ozone layer depletion (ODP): Potential of substances such as chlorofluorocarbons and halons to deplete the stratospheric ozone layer. Expressed as kg CFC-11 equivalent.

Photochemical ozone formation (POCP): Potential of volatile organic compounds and NOx to form ground-level ozone. Expressed as kg C2H4 (ethylene) equivalent or kg NMVOC equivalent. Related to smog and respiratory diseases.

Water use: Freshwater consumption and contribution to water scarcity. Expressed as m3 or m3 equivalent. Connected to water footprint assessment.

Resource depletion (abiotic): Mineral and fossil resource use. Expressed as kg Sb (antimony) equivalent or MJ. Related to raw material scarcity.

Human toxicity and ecotoxicity: Impact of harmful substances on human health and ecosystems. Expressed in CTUh (human) and CTUe (ecosystem) units.

Trade-offs between impact categories

One of LCA's most valuable contributions is revealing trade-offs between different environmental impacts.

Example 1: Bioplastic vs petroleum-based plastic Bioplastic may have a lower carbon footprint (biogenic carbon). But eutrophication and land use impacts may be higher due to agricultural production. Looking only at PCF hides this trade-off.

Example 2: Electric vehicle vs internal combustion engine Electric vehicle produces zero exhaust emissions during use phase. But resource depletion (lithium, cobalt) and production energy intensity are higher during battery manufacturing. LCA enables seeing the total impact throughout the life cycle.

Example 3: Lightweight packaging Lighter packaging consumes less fuel during distribution (lower carbon). But thinner material may reduce product protection and lead to more product damage/loss. LCA enables system-wide optimization.

EPD (Environmental Product Declaration) connection

EPD (Environmental Product Declaration) is the standardized format for publicly disclosing LCA results. It is prepared according to ISO 14025 standard.

EPD features:

• Product Category Rules (PCR) are followed
• Third-party verification is mandatory
• Multiple impact categories are reported
• Enables international comparability
• Published by program operators (EPD International, IBU, etc.)

Full LCA is required for EPD preparation. PCF alone is not sufficient.

Scope and output difference

When to use which?

PCF is preferred:

Regulatory requirements:

• CBAM (Carbon Border Adjustment Mechanism) declarations
• Carbon labeling requirements
• Supply chain carbon reporting

Customer demands:

• If the customer only wants carbon data
• If there is a carbon criterion in supplier evaluation
• If product-based carbon targets are being tracked

Quick and focused work:

• During pilot study or screening phase
• For carbon comparison of specific products
• For hotspot analysis

LCA is preferred:

EPD and certification:

• If EPD (Environmental Product Declaration) will be prepared
• If applying for Ecolabel or environmental label
• For green building certifications (LEED, BREEAM)

Product development:

• If multiple impacts will be evaluated in product design
• If material selection decisions will be made
• If packaging optimization will be done

Strategic decisions:

• If trade-offs need to be understood
• If long-term sustainability strategy will be developed
• If comprehensive information is needed for investment decisions

Data requirements comparison

Data required for PCF:

• Energy consumption (electricity, fuel, heat)
• Raw material quantities
• Production process data
• Transportation distances and modes
• Waste quantities (for energy recovery)

Additional data required for LCA:

• Water consumption and discharge
• Chemical use (including toxic substances)
• Air emissions (VOC, particulate matter)
• Water emissions (heavy metals, nutrients)
• Land use change
• End-of-life scenario details

Cost and duration comparison

PCF project:

• Duration: 4-8 weeks (single product, existing data)
• Team: 1-2 experts
• Cost: Low-medium level

LCA project:

• Duration: 12-20 weeks (single product, detailed)
• Team: 2-4 experts (different areas of expertise)
• Cost: Medium-high level

LCA requires more resources because it is more comprehensive. However, unit cost decreases when working on multiple products.

Conclusion

PCF can be thought of as part of LCA. But the purpose and output are different. Which study is needed is determined by the intended use.

When making a decision, answer these questions:

• What is the stakeholder expectation? (carbon only or multiple impacts?)
• Is there a regulatory requirement? (CBAM, EPD, label)
• Is it product design or reporting? (is trade-off analysis needed?)
• What are the budget and time constraints?

In most cases, starting with PCF and then expanding to LCA as needs arise is a reasonable approach. Data collected during PCF study forms the foundation for LCA.