Purchasing has shifted: large B2B customers no longer ask only about price, quantity and lead time, but about the carbon footprint of every single item. They need these values for their own climate accounting, for tenders and for the reports they owe to their customers and regulators. Since 1 January 2026 the European carbon border adjustment mechanism CBAM has been in its definitive phase, with an obligation to buy certificates for imported embedded emissions (European Commission), and the requirement to deliver product-level climate data is being passed down step by step from large buyers to their suppliers. For B2B trade this means the shop becomes an ESG data supplier. Whoever maintains and displays the product carbon footprint per item number gives their customers an edge in their balance sheet - and themselves an edge in the tendering process. Whoever fails to deliver the data loses tenders to competitors who can. This article explains what a product carbon footprint is, where the values come from and how to maintain and display them per item in a Shopware shop.
Key takeaways
- B2B buyers now demand CO2 values per item because most of their footprint sits in the supply chain: upstream Scope 3 emissions are on average around eleven times a company's direct emissions (CDP).
- The product carbon footprint follows recognised rules - the GHG Protocol Product Standard (GHG Protocol) and ISO 14067 (ISO) - and is stated in CO2 equivalents. Without a stated system boundary a value is not comparable.
- The values mix primary data from real processes with secondary data from life-cycle databases. Standards for exchanging them are emerging, such as the Pathfinder Framework (WBCSD) and Catena-X (Catena-X).
- In the shop the PCF belongs on the item as its own numeric field, with separate fields for unit, reference quantity, method, system boundary, data source and date of collection - maintained in the PIM, not as free text in the description.
- The value becomes visible on the product page, as a total in the cart and on the documents. The sales advantage comes from the PDF and CSV export that purchasing can adopt without rework.
Why B2B Buyers Now Demand CO2 Data per Item
The pressure comes not from marketing but from customers' balance sheets. For most companies the largest part of their carbon footprint lies not in their own operations but in the supply chain. According to analyses by the climate disclosure platform CDP, upstream Scope 3 emissions are on average around eleven times a company's direct emissions (CDP). Anyone who wants to reduce or even just correctly report their own climate balance therefore has to know how much CO2 is embedded in the goods they buy - and only the supplier can provide that. A buyer choosing between two technically equivalent offers increasingly decides based on which supplier transparently discloses the footprint per line item and which answers only with blanket statements.
On top of this comes the regulatory framework. Since January 2026 the carbon border adjustment mechanism CBAM has required, in its definitive phase, that importers buy certificates for the embedded emissions of certain goods; covered first are cement, iron and steel, aluminium, fertilisers, electricity and hydrogen (European Commission). In parallel, European sustainability reporting obliges large companies to disclose emissions along the value chain as well (European Commission) - a requirement they pass on to their suppliers, even where the supplier is not directly obliged to report. The trend is already visible in the market: one large B2B distributor states it discloses the product carbon footprint for around 60,000 products, based on the GHG Protocol and ISO 14067 (retail.at). Anyone selling in B2B will find this question in tender documents more and more often in the coming years.
Tenders
Public and large private tenders increasingly demand product-level CO2 figures. Without the value, an offer falls back in the scoring or drops out entirely.
Customer Balance
Your customers need the footprint of the goods they buy for their own Scope 3 balance. Your item value becomes an input into their climate calculation.
Reporting Duties
Large buyers pass CSRD and CBAM requirements down to their suppliers so that their own reports hold up.
Competition
Whoever delivers product-level values stands out among otherwise equal offers. Sustainability becomes a measurable business driver in purchasing (EcoVadis).
Border Adjustment
CBAM puts a cost on imported emissions. Knowing the emissions of your products lets you align offers and sourcing accordingly.
Supply Chain
The requirement is passed from tier to tier. What the end customer demands from the manufacturer, the distributor demands from the upstream supplier.
What a Product Carbon Footprint Actually Is
The product carbon footprint, or PCF, is the amount of greenhouse gases generated over a defined stage of a product's life, expressed in CO2 equivalents (CO2e). The equivalent combines different greenhouse gases - besides carbon dioxide, for example methane and nitrous oxide - into a single figure via their respective warming potential. The PCF is not a freely invented number but follows recognised accounting rules. The two decisive foundations are the GHG Protocol Product Standard (GHG Protocol) and the ISO 14067 standard (ISO), both of which build on the general life-cycle assessment methodology of ISO 14040 and ISO 14044 (ISO). They define which emissions are included, how to handle multi-product processes and how the result is documented.
The decisive point is the system boundary - that is, which part of the life cycle is counted. Two variants are the most common. Cradle-to-gate captures all emissions from raw material extraction to the manufacturer's factory gate, i.e. precursors, upstream chain and production. Cradle-to-grave additionally adds distribution, use phase and disposal. For B2B trade the cradle-to-gate value is usually the practical entry point, because it can be determined reliably and the use phase of a precursor product often cannot sensibly be attributed to the distributor. It is important to clearly state the chosen boundary: a value without its system boundary is worthless because it is not comparable. The rule of thumb is to always attach the method and the system boundary to the value.
CO2e, Not Just CO2
Where the Values Come From: Primary and Secondary Data
The quality of a PCF stands or falls with the data basis. There are two sources. Primary data come directly from the real process - the actual energy consumption of a production line, the concrete material composition, the real transport distance. Secondary data come from average values and life-cycle databases, for example stored emission factors for materials and energy carriers (ecoinvent). In practice a PCF is almost always a mix: for your own processes you use primary data, for precursors you fall back on supplier figures or, where these are missing, on database values. The higher the share of genuine primary data from the chain, the more robust and usually the lower the uncertainty of the result.
For the exchange of genuine primary data between companies, standards are emerging that turn the PCF from an internal estimate into a shareable figure. The Partnership for Carbon Transparency, with its Pathfinder Framework, defines how companies exchange product-level CO2 values in a machine-readable and methodologically consistent way (WBCSD). In the automotive industry the Catena-X data ecosystem sets comparable rules for PCF exchange along the chain (Catena-X). For transport and logistics emissions the GLEC Framework provides a recognised calculation basis (Smart Freight Centre), and for construction products, environmental product declarations under EN 15804 offer ready, verified data sheets (ISO). Anyone who wants to disclose CO2 values in the shop must know these sources, because they determine how credible and how comparable the disclosed value ultimately is.
| Criterion | Primary Data | Secondary Data |
|---|---|---|
| Origin | Real process, measured | Database and average values |
| Accuracy | High, product-specific | Coarse, typical for the category |
| Effort | Higher, collection needed | Lower, immediately available |
| Use | Own processes, core suppliers | Precursors without their own figure |
| Strength | Robust for tenders | Good starting value, refine later |
Maintaining CO2 Values per Item Number in Shopware
Technically the PCF is at its core an additional attribute on the item - comparable to weight, dimension or customs tariff number. In a Shopware shop this attribute can be modelled through additional fields on the product: a numeric value for the footprint, a field for the unit and reference quantity, a field for the method and system boundary, and a field for the data source and date of collection. In this way the value is not only displayed but stored in a structured form, so that it can be filtered, exported and taken into documents. The mistake to avoid is free text in the description field: a CO2 value that only sits as running text somewhere in the item description is useless for evaluation and export.
With a few dozen items you can maintain the values manually. With thousands or tens of thousands of items there is no way around a connection to the leading data system. Sensibly, the source of truth for the PCF is not the shop but the PIM or a specialised sustainability tool, from which the value is fed per item number into the shop - just as prices and stock come from the ERP and inventory system. This keeps the value centrally maintainable, versioned and consistent across all channels. If the electricity mix of a plant or the material composition changes, the value is updated in one place and flows automatically into the shop, into quotes and into the exports.
- A dedicated numeric field for the PCF per item, not free text in the description
- Separate fields for unit, reference quantity, method and system boundary
- A field for data source and collection date for traceability
- Maintenance in the PIM as the source of truth, automatic handover to the shop
- Versioning so that old quotes keep the value that was valid at the time
- Exportable as CSV and as a PDF data sheet for the customer's purchasing team
One Field, Many Outputs
How the CO2 Value Becomes Visible in the Shop
Once the value is cleanly maintained, it is about presentation. The first place is the product detail page: there the footprint per unit or per reference quantity is shown clearly next to the technical data, stating unit, method and system boundary. The second place is the cart and checkout: from the individual values and quantities the footprint of the entire order can be summed up, so the buyer immediately sees the CO2 load their procurement triggers. The third place is the documents - quote, order confirmation and invoice - where the value appears per line and as a total, so the customer can take it directly into their own balance. How quotes in B2B are created in a structured and legally sound way is closely tied to e-invoicing and structured documents.
For professional buyers the most valuable building block is the export. A data sheet per item or a bulk export over the entire cart - as a PDF for humans and as CSV or a structured file for the system - makes the PCF connectable to the customer's procurement and accounting software. This is exactly where the sales advantage arises: it is not the nicely rendered number in the frontend that wins the tender, but the clean, exportable, methodologically documented figure the buyer can take into their systems without rework. In the customer portal this can be combined with a history, so that a customer can evaluate the CO2 values of their orders over the year - a topic closely interwoven with other self-service functions in the B2B portal.
Product Detail Page
The footprint per unit is shown visibly with the technical data, stating unit, method and system boundary - not hidden in running text.
Cart and Checkout
From individual values and quantities the footprint of the whole order is summed up and shown to the buyer before completion.
Export for Purchasing
A data sheet as PDF and a structured CSV file make the PCF directly connectable to the customer's accounting software.
History in the Portal
In the customer portal the CO2 values of past orders can be collected and evaluated over periods - matching the reporting logic of customers.
CBAM, Reporting Duties and the Legal Framework
The PCF is increasingly not just a sales argument but the answer to concrete obligations of the customers. In its definitive phase running since January 2026, the carbon border adjustment mechanism CBAM requires, for the covered goods, proof of embedded emissions and the purchase of certificates by the importer (European Commission). Anyone supplying or processing such goods will be asked for these emission values. In parallel, sustainability reporting obliges large companies to record and disclose their emissions along the value chain (European Commission); the scope of affected companies was recalibrated in 2025 as part of a simplification, but the fundamental duty to cover the value chain remains. Both mean that product-level CO2 data move from optional extra to a demanded figure.
The clear distinction is important: whoever discloses CO2 values makes statements that must be provable. Vague or embellished figures are not only a reputational risk but can be challengeable under competition law. The consequence for the shop is sobriety: disclose values with method, system boundary, data source and date, name uncertainties, and use no blanket climate labels without a basis. A transparent, methodologically documented value convinces professional buyers more than a green seal without substance - and at the same time protects against the accusation of advertising with unsubstantiated environmental claims.
Provable, Not Embellished
Securing Data Quality and Comparability
The biggest practical problem is not the display but comparability. Two values for seemingly identical products can only be compared if system boundary, reference quantity and method are identical. A cradle-to-gate value per unit and a cradle-to-grave value per kilogram are simply different things. This is why the consistent carrying-along of the metadata - method, boundary, unit, source, date - is not a formality but the precondition for the value being usable at all. For your own credibility it is better to disclose an honest secondary-data value with a clear label than a falsely precise primary value without origin.
Pragmatically, a maturity model works well. You start with secondary data from recognised databases for the most important goods categories, clearly label these as average values and replace them step by step with primary data from your own processes and core suppliers. This creates an early, usable, honest value that becomes more accurate over time, instead of waiting years for the perfect full survey. This stepwise approach fits any solid Shopware implementation with a clean data basis, because the same channels that keep prices and stock current can also maintain and improve the CO2 values. Comparable maturity approaches for data-driven B2B processes can be found in our project examples.
A CO2 value without method, system boundary and data source is not a figure but a claim. Only the carried-along origin turns a number into a robust, comparable and exportable metric.
Step by Step to the PCF in the Shop
The road to a disclosed product carbon footprint begins not with the frontend display but with the data structure behind it. Whoever first clarifies the fields, sources and metadata can then roll out the disclosure in many places without creating contradictory values. A sensible approach proceeds in manageable steps that deliver a usable value early and then refine it. The following sequence has proven itself for B2B shops that want to bring the PCF from concept into productive use. Which building blocks count first for your assortment and your customers depends on which goods categories are already being asked about for CO2 values in tenders today.
- Define the data model: fields for value, unit, reference quantity, method, system boundary, source and date
- Determine the source of truth: maintain the PCF in the PIM or sustainability tool, not in the shop
- Set starting values: secondary data for the most important goods categories, clearly labelled as averages
- Build the connection: automatic handover of the values per item number into the Shopware shop
- Roll out the disclosure: product detail page, cart total, documents and export for purchasing
- Bring in primary data: switch core suppliers and own processes step by step to real measured values
Whoever understands the product carbon footprint as a structured data field and not as green decoration turns a growing customer requirement into a concrete sales advantage. The shop then delivers exactly the data the buyer needs for their balance and their tender - per item, methodologically documented and adoptable without rework. This requirement increasingly overlaps with other developments in B2B trade, for example when AI agents order in the shop in future and also filter by CO2 criteria, or when automatic credit checks and CO2 disclosure become jointly part of a robust, data-driven offer. Which steps make sense for your shop we are happy to clarify in a direct conversation.