What verification means

Verification is an independent review of an existing carbon accounting’s methodology, source data, calculation chain, and conclusions. The goal is to confirm that the accounting follows GHG Protocol or another agreed standard and that the results are reliable.

The output is a written assurance statement that you can forward to a client, investor, or include in your report.

Who this is for

Verification is the right service when a company has existing carbon accounting that needs independent assurance before external use; a customer or supply chain partner requires third-party verification; an investor or shareholder requests confirmed accounting in due diligence; or a company wants to ensure its internal calculation is methodologically sound.

What NGS reviews

Methodology — is the accounting boundary set per GHG Protocol? Is the selection of Scope 3 categories justified?

Source data — are emission factors current and appropriate? Is primary data used correctly? Are estimates documented?

Calculation chain — are calculations correct? Are units consistent?

Reporting — does the report meet GHG Protocol reporting requirements?

What you get

Written assurance statement (limited or reasonable assurance as required)
Findings memo with any gaps and recommendations
Summary of methodological strengths and development areas

Frequently asked questions

What is the difference between limited and reasonable assurance?

Limited assurance: “We found nothing to suggest the accounting is incorrect.” Reasonable assurance: “The accounting was prepared in accordance with the standard.” Limited assurance is sufficient for most purposes.

Can NGS verify its own calculations?

No — that would conflict with independence requirements. Verification is performed on calculations done by a third party or internally by the company.

Carbon Accounting Verification