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Carbon footprint resources to understand and decide.

Here we gather material to understand the product carbon footprint and Scope 3 without jargon: a glossary with the most used terms, a guide to calculate Category 1 (Xain also covers Category 2) and a comparison between a product footprint and an environmental declaration. Every page cites the official sources.

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These resources are educational. They do not replace the standards or legal advice, and every page links to the official source so you can check what it says.

What will you find?

  • Glossary: definitions of twenty key terms, from emission factor to digital product passport.
  • Guides: how to calculate Scope 3 Category 1, step by step and with the four possible methods.
  • Comparisons: how a product carbon footprint differs from an environmental product declaration.

Where to start?

If it is the first time you hear about the product footprint, start with the glossary. If you already know what you want to measure in your purchases, go to the Category 1 guide. If you hesitate between two types of document, read PCF versus EPD.

You can also read our sheet for AI assistants, which summarises what Xain is and which facts are worth citing.

In this section

  • Glossary

    Glossary of product carbon footprint and Scope 3 with twenty key terms: emission factor, ISO 14067, GHG Protocol, CSRD, EPD or CBAM, with official sources.

  • Calculating Category 1

    Guide to calculating Scope 3 Category 1, purchased goods and services: the four GHG Protocol methods, the steps and when each one fits best.

  • PCF versus EPD

    Difference between a product carbon footprint (PCF, ISO 14067) and an environmental product declaration (EPD, ISO 14025): what each measures, when to use it.

  • Xain versus consulting

    When software makes sense and when a consultancy does for calculating product footprint or Scope 3: lead times, repeatability, traceability and scope of each.

  • Methodology

    How Xain calculates the product carbon footprint: physical factors, process tree, most conservative factor and primary data. An ISO 14067 methodology by LRQA.

  • Solutions

    Software that calculates and certifies the product carbon footprint and Scope 3 of purchases with physical factors and an ISO 14067 method verified by LRQA.

  • Glossary

    Glossary of product carbon footprint and Scope 3 with twenty key terms: emission factor, ISO 14067, GHG Protocol, CSRD, EPD or CBAM, with official sources.

Tell us what you want to measure

One product, a catalogue or your purchases. We reply with the next steps.

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