Precisely scoped statement
Does the environmental benefit refer to the entire product, a component, packaging, a production stage or the company?
BuVNK · Green Claims · Business guidance
Green Claims: Evidence and Substantiation for Environmental Claims
Environmental benefits advertised to customers should be clearly defined and backed by relevant, current and verifiable information. This guide explains how businesses can organise a traceable evidence file for each claim.
Practical guidanceEmpCo law in 2026Official EU sources
Legal framework at a glance: Legal status: 14 October 2026. Member States must apply national measures implementing Directive (EU) 2024/825 (EmpCo) from 27 September 2026. The separate Green Claims Directive remains a legislative proposal, not law in force. The documentation steps below are practical recommendations; actual legal obligations depend on the claim and applicable law.
01 / Foundations01 / Claim 02 / Evidence 03 / Communication
What reliable claim evidence should demonstrate
Evidence needs to match the precise claim. A certificate, measurement or calculation alone may not be sufficient if its scope, time frame or subject are unclear. Clarity, traceability and a direct connection between the advertisement and its supporting material are essential.
Reproducible support
Are data, measurement methods, calculation boundaries, dates and any independent reviews sufficiently documented?
No overstatement
Does the marketing avoid suggesting a greater benefit or certainty than the evidence actually supports?
02 / Evidence types
Which evidence supports which environmental claim?
The table is practical guidance for marketing, sustainability, product and compliance teams. It does not replace sector-specific standards or legal advice.
| Claim type | Potentially useful evidence | Key questions to ask |
|---|---|---|
| Recycled content | Material records, supplier declarations, batch specifications, calculation method and, where useful, test reports. | What exactly does the percentage cover? Is the calculation mass-based? Can the data be traced? |
| Product carbon footprint | Emissions inventory, activity data, emission factors, system boundaries, methodology and relevant review reports. | Is the value per unit or company-wide? Which year and life-cycle stages are included? |
| CO₂ reduction | Comparable baseline and reporting periods, consistent functional units and methods, documented changes. | Are like-for-like processes or products compared? Is the difference attributable to real changes? |
| Recyclability | Material specifications, testing, available collection/sorting/recycling arrangements in target markets, relevant standards. | Is it technically recyclable, and are viable processes available in the markets addressed? |
| Energy or water savings | Meter readings, test conditions, measurement setup, relevant comparator and use scenarios. | Are the measured conditions representative of typical customer use? |
| Labels and certificates | Current certificate, certification scope, scheme rules, issuing body and surveillance requirements. | Does the certificate support the specific advertised benefit? Is use of the label permitted? |
03 / Review process
Eight steps to a review-ready claim file
A claim file is a recommended internal record for approving and periodically reviewing individual environmental statements.
Record exact wording
Save the precise text, visuals, footnotes, audience and publication location (website, packaging, social media).
Define the subject
Specify product version, packaging, plant, process stage, supply chain and geographic scope.
Set dates and baseline
Document the measurement period, baseline year, data vintage, comparators and functional units.
Describe methods
Record calculation rules, relevant standards, system boundaries, assumptions, exclusions and uncertainties.
Attach evidence
Link source data, test results, supplier information and, where available or needed, independent verification.
Evaluate consistency
Check significance, data quality, representativeness and whether relevant negative effects are concealed.
Approve communications
Arrange coordinated review of wording, visuals and qualification notes by experts, marketing and legal/compliance.
Schedule revalidation
Set the next review date and triggers such as new data, process changes or legal developments.
Suggested contents of an internal evidence file
For each significant environmental claim, consider keeping a separate version-controlled record covering:
- Exact claim and approved language versions
- Product, service or organisational scope
- Publication channels and target markets
- Measurement period, baseline and data vintage
- Methods, standards and system boundaries
- Data tables, test results and supplier documents
- Technical / legal approval and accountable owners
- Review deadline, changes and reassessment history
04 / Technical guidanceClimate-related claims Life cycle and markets Labels and certificates Supplier data
Evidence considerations for different claim categories
System boundaries and comparable baselines
For “CO₂ reduced”, readers need to know which life-cycle stage, unit and comparator are meant. “Climate-neutral” wording needs particular care: EmpCo expressly addresses product claims alleging neutral, reduced or positive greenhouse-gas impact based on carbon offsetting.
Remember: For product climate claims, separate actual emissions reductions from compensation.
Representative assessment
An improvement at one production stage does not automatically substantiate a blanket claim about the whole product. Consider relevant life-cycle impacts and differences between marketed countries.
Remember: Life-cycle assessment can be helpful; this does not mean every claim is subject to an across-the-board LCA requirement.
Scope matters
Check whether the certificate or label actually covers the advertised product, feature and supply-chain boundaries. EmpCo includes specific rules for sustainability labels.
Remember: An ISO standard, supplier self-declaration or one test mark is not general approval for every marketing claim.
Traceable and current
Ask for material inputs, version history, methods and data origin. Distinguish measured, modelled, estimated and industry-average figures.
Remember: With inadequate supplier evidence, qualify or postpone the claim until the information can be checked.
05 / Worked examples
Examples: connecting marketing wording to supporting records
Example A: Recycled content
Example wording: “Our packaging contains 35% recycled plastic.”
- Define the weight-based denominator (for example, plastic components of packaging).
- Connect supplier and material records to product identifiers, batch or time period.
- Update the percentage when suppliers or packaging composition change.
Risk: Do not imply the entire product contains 35% recycled plastic if the evidence only concerns its packaging.
Example B: CO₂ savings
Example wording: “18% less CO₂e in manufacturing compared with 2023.”
- Use a consistent production unit and comparable system boundaries.
- Document calculation method and changes in energy mix.
- Specify whether the claim concerns manufacturing only or the entire product life cycle.
Risk: Even a precise percentage can mislead if the baseline and boundaries are not clear.
06 / FAQ
Frequently asked questions about claim evidence
Does every environmental claim need external certification?
Not as a blanket rule. Appropriate support depends on the claim and applicable law. Certain sustainability labels face specific restrictions. Additional requirements in the pending Green Claims proposal must not be presented as rules already in force.
Does ISO certification prove a product is “eco-friendly”?
Not automatically. Certification of a management system does not itself prove that a specific product is environmentally beneficial across its whole life cycle. The certification scope and marketing statement need to align.
Can supplier declarations be used?
They can form part of the evidence file. Reliability, traceability and relevance matter; some claims may need additional measurements, methods disclosure or independent review.
How long should a company keep its evidence?
There is no single EU retention period established here for every environmental claim. National, sector-specific and contractual requirements may apply. A sensible internal retention and update policy is recommended.
Which law applies in 2026?
National measures implementing EmpCo apply from 27 September 2026, alongside applicable rules against misleading commercial practices. The separate Green Claims Directive is still a legislative proposal.
07 / EU
Official EU sources and legislative texts
- EmpCo Directive (EU) 2024/825Binding EU directive including its implementation date and amendments to consumer protection law.
- European Commission – Green Claims proposalOfficial overview of the proposal; it is not yet in force.
- EUR-Lex – COM(2023) 166 finalOriginal text of the separate proposed Green Claims Directive.
- European Commission – Unfair commercial practicesInformation about misleading practices and official guidance.
Legal and content update: 14 October 2026. Not individual legal advice.
Turn an environmental promise into a traceable claim
BuVNK provides guidance on Green Claims, EmpCo and greenwashing. Start with the practical checklist or review the relevant EU framework on our topic pages.