GHG Protocol Product Standard

The GHG Protocol Product Life Cycle Accounting and Reporting Standard (commonly called the GHG Protocol Product Standard) is the global methodology developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD) to quantify and report the carbon footprint of products across their entire life cycle.

Published in 2011, it is part of the wider Greenhouse Gas Protocol family of standards and complements the corporate accounting standards (Scopes 1, 2 and 3). It is closely aligned with ISO 14067, the current ISO standard for the product carbon footprint (PCF).

Objectives of the standard

• Comparability and consistency across sectors and regions.
• Transparency in assumptions, data sources and system boundaries.
• Credibility through independent verification and critical review.
• Continuous improvement: identifying emission hotspots and supporting reduction strategies.

Scope and functional unit

• Cradle-to-grave coverage: raw material extraction, manufacturing, distribution, use and end-of-life stages.
• Functional unit: a quantitative measure describing the product's function (for example, 1 kWh supplied or 1 L bottle).

Process steps

1. Define objectives, scope and system boundaries.
2. Build a GHG inventory using a life cycle assessment approach, collecting primary and secondary data.
3. Calculate impacts: multiply activity data by emission factors (for example IPCC or ecoinvent).
4. Allocation: distribute emissions among co-products by energy, mass or economic value.
5. Model use and end-of-life scenarios: recycling, energy recovery or landfill.
6. Calculate results and run a sensitivity analysis.
7. Report, review and optionally verify with a third party.

Greenhouse gases covered

CO₂, CH₄, N₂O, HFCs, PFCs, SF₆ and NF₃, expressed as CO₂ equivalents (CO₂e) using 100-year Global Warming Potentials (GWP 100) from the IPCC.

Relationship with other standards

• ISO 14067: highly compatible, with minor differences in reporting requirements; it is the reference ISO standard for product carbon footprints.
• PAS 2050: the British specification developed alongside the GHG Protocol Product Standard. It is now largely superseded by ISO 14067 and is no longer the preferred reference, although it shaped early product footprinting practice.
• EPD / ISO 14025: PCF results can feed into Type III environmental declarations.

Benefits for organisations

• Visibility of hotspots: enables targeted emission and cost reductions.
• Market demand: large buyers and investors increasingly require GHG Protocol-based PCF data.
• Regulatory relevance: supports frameworks such as the CBAM, carbon labelling and ESG reporting.
• Competitive advantage: transparent communication of measurable improvements.

Example applications

• Food industry: comparing the impact of animal versus plant-based proteins.
• Electronics: optimising smartphone design by reducing materials and use-phase energy impacts.
• Construction: calculating PCFs for steel and concrete components in low-carbon building assessments.

Common challenges

• Scope 3 data gaps: complex global supply chains make accuracy difficult.
• Confidentiality: suppliers may be reluctant to share primary data.
• Temporal consistency: electricity mixes and emission factors change over time.

Best practices

• Use dedicated LCA software for traceability and automation.
• Establish data-sharing agreements with key suppliers.
• Review footprints periodically (every two to three years) to capture improvements and updated factors.

The GHG Protocol Product Standard is a global benchmark for measuring product-level carbon footprints with rigour, comparability and transparency. At Manglai we help companies measure their carbon footprint, including product-level emissions, and prepare credible sustainability reporting. Discover how Manglai can help you.