Carbon footprint verification

The verification and certification of the carbon footprint are key steps in managing greenhouse gas (GHG) emissions. They give credibility, transparency and accuracy to reported data, which is essential for building stakeholder trust and meeting regulatory requirements. Verification is the independent check of the data; certification is the formal recognition that a footprint meets a given standard.

Why verification and certification matter

Ensuring data quality

The accuracy of a carbon footprint depends on the quality of the underlying data. Verification helps detect errors, omissions or inconsistencies in data collection, calculation and reporting, so the footprint reflects an organisation's real emissions.

Building stakeholder trust

A report verified by an independent third party is more credible to investors, customers, regulators and the public. It demonstrates a commitment to transparency and accountability in sustainability reporting.

Meeting legal and regulatory requirements

In some jurisdictions and sectors, carbon footprint verification is required. Under the EU Corporate Sustainability Reporting Directive (CSRD), in-scope companies must have their sustainability information, including GHG data, externally assured, starting with limited assurance. In Spain, companies registering in the carbon footprint registry managed by MITECO follow defined calculation and verification rules. The EU Taxonomy (Regulation (EU) 2020/852) also relies on robust, verifiable environmental data.

Identifying opportunities for improvement

The process often highlights where data management, calculation accuracy and reduction measures can be strengthened.

Stages of the verification process

1. Internal review

Before external verification, an internal review checks data, methodologies, calculations and the report narrative to catch and correct errors.

2. Selecting a verifier

Choose an independent, accredited verifier with technical expertise. Independence from the reporting organisation is essential for objectivity.

3. Verification

The verifier evaluates the report, reviews the methodologies, checks data and calculations, and assesses the report's integrity and transparency. They may request additional information or clarifications.

4. Verification statement

On completion, the verifier issues a statement summarising findings and conclusions. Depending on the depth of the work and the level of confidence, this may take the form of limited assurance, reasonable assurance or, where appropriate, an adverse or qualified opinion.

Standards and methodologies

Several international standards guide the preparation and verification of carbon footprints:

• GHG Protocol: the most widely used standard for GHG inventories, with guidance for quantification and reporting.
• ISO 14064: sets requirements for quantifying and reporting an organisation's GHG inventory (Part 1) and for its validation and verification (Part 3).
• ISO 14067: specifies how to quantify the carbon footprint of a product.
• ISO 14068-1: sets out requirements for demonstrating carbon neutrality, where verification is central.

Best practices

Plan ahead

Define objectives, scope, resources and timelines for the verification in advance.

Document thoroughly

Keep detailed records of data, methodologies, calculations and assumptions to make verification easier.

Communicate effectively

Maintain clear communication between the internal team and the external verifier to resolve queries quickly.

Treat it as continuous improvement

Use the verifier's recommendations to strengthen carbon management year on year.

At Manglai we help companies measure, verify and certify their carbon footprint and prepare auditable sustainability reporting. Discover how Manglai can help you.