Greenhouse Gas Verification

Strengthen Your Emissions Reporting with Greenhouse Gas Verification

Accredited Verification for Your Company's GHG Inventory

Understanding your company’s carbon emissions data is vital to managing your carbon footprint. Annual third-party verification of your GHG inventory ensures your reporting is free of material errors giving you much greater confidence in reporting. Verified accounting is vital to management of climate-related risks, identifying cost-saving opportunities and keeping pace with regulatory compliance. Greenhouse Gas verification may soon be required by the SEC and a growing list of other agencies including GSA, the state of California and the EU with their CSRD initiative.  Accurate GHG reporting is also increasingly important in supply chains and required by some major retailers. Showcasing your GHG verification in your CSR report also enhances brand reputation and competitiveness and gives stakeholders greater confidence in your reporting. 


This diagram shows the common greenhouse gases and their sources divided into Scopes 1, 2, & 3. 

Why Choose SCS?

SCS Global Services is an ANSI National Accreditation Board (ANAB) accredited third-party verification body under ISO 14065. SCS has provided third-party Greenhouse Gas verification for over 15 years with more than 300 verifications for organizations of all sizes including some of the largest Fortune 500 companies. Industry sectors include: Food and Agriculture, Apparel, Manufacturing, Technology, Airlines, Retail, Building Materials, Municipalities, Utilities and many more. SCS auditors employ the most current accounting principles and GHG calculation methodologies including the complex verifications for Scope 3 categories. Positive verification statements can be shared publicly on your website, in your annual CSR reporting and with reporting frameworks to underline your commitment to accuracy in greenhouse gas accounting. SCS boasts a 90% customer return rate based on our consistent customer service and on-time delivery.

  • Schemes
  • Process
  • Clients and Projects


CORSIA (Carbon Offsetting and Reduction Scheme for International Aviation)

The Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) is a global scheme to ensure the low carbon growth of the international aviation sector from 2020 onward. CORSIA is the world's first mandatory sector-specific compliance carbon pricing scheme. Under CORSIA, all airline operators with annual emissions greater than 10,000 tonnes of CO2 are required to report their emissions from international flights on an annual basis. 


World Resources Institute (WRI) Greenhouse Gas Protocol 

The WRI Greenhouse Gas Protocol is the global standard for companies and organizations to measure and manage their GHG emissions. The most popular standard used today, the GHG Protocol provides the accounting platform for virtually every corporate GHG reporting program in the world. It includes a series of standards that can be used by companies, cities, communities and more as a framework for showcasing excellence in the reporting of greenhouse gas inventories. The popularity is driven by deep stakeholder consultation facilitated by WRI and WBCSD. 



CDP, formerly the Carbon Disclosure Project is a not-for-profit the runs the global disclosure system for investors, companies, cities, states and regions. 18,700+ companies disclose to CDP representing half of global market capitalization. The platform is heavily utilized by investors who request companies to disclose through CDP.

The Climate Registry

The Climate Registry (TCR)

TCR is an independent non-profit that operates the preeminent voluntary GHG resporting program in North America. In the last 10 years, leading companies, universities, electric utilities and government agencies have registered more than 1.8billion tons of carbon dioxide equivalent (CO2e). TCR members use their rigorous, best-practice reporting guidance to measure and report their carbon inventories in CRIS (Climate Registry Information System).        


California Air Resources Board (CARB) Mandatory Reporting Requirement (MRR) 

Reporting of greenhouse gas (GHG) emissions by major sources is required by the California Global Warming Solutions Act of 2006 (AB 32). MRR is applicable to electricity generators, industrial facilities, fuel suppliers and electricity importers. Operators of facilities located in California with specific source categories are subject to reporting when stationary combustion and process emissions of CO₂, CH₄, and N₂O equal or exceed 10,000 metric tons CO₂e for a calendar year.

  1. Apply for Verification
    Complete an SCS Application Form, including a description of the project and its location. SCS staff will return a proposal to you for signature. To initiate the verification process, return a signed proposal and contract agreement.
  2. Submit Inventory Documentation
    Our qualified verification team will review your inventory documentation for completeness, conduct a desk review of all documentation, and issue findings. Applicants can address findings before the site visit is conducted.
  3. Site Visit
    SCS conducts site visit(s) to assess project compliance with applicable program standards and issues findings from the visit. This includes an office visit and a field visit.
  4. Technical review
    Once the verification has been satisfactorily completed, an independent technical reviewer cross-checks the GHG inventory and audit report.
  5. Verification Report
    SCS will make a final verification decision and issue a report. You will need to acknowledge the report and resolve any corrective actions (ie errors in measurement or gaps in procedures) before the deadline for emission data submission.
  6. Verification Opinion
    A final verification opinion statement is submitted to the applicable GHG program for registration. SCS can also provide client marketing support.


SCS Global Services has conducted carbon footprint verification (also called "greenhouse gas inventory verification") for manufacturing, non-profit, corporate, and municipal clients, including aviation, waste management, manufacturing, transportation, high tech and professional services.

Featured Projects

Examples of satisfied clients include:

Owens Corning

Fortune 500 entity Owens Corning started verifying their GHG inventory with SCS in 2012 and has increased the scope of their verification each year. They have earned CDP A-List status, limited to the top 25 performing companies, for both water and climate since 2016. In 2018, SCS not only verified Owens Corning’s GHG inventories, but extended assurance to their entire sustainability report based on the AA 1000 standard. Their efforts have earned them a No. 1 ranking on 3BL Media’s list of the 100 Best Corporate Citizens every year since 2019.

San Diego Gas & Electric

San Diego Gas & Electric (SDGE)

SDGE utilizes SCS as their verifier for both California Mandatory Reporting Requirement and to report their emission to The Climate Registry. Having a verifier that can handle the requirements of both schemes significantly streamlines the verification process for SDGE. 

Hewlett Packard Enterprise

Hewlett Packard Enterprise

HPE has utilized SCS as their verification body since 2019. They verify their full inventory Scopes 1, 2, and 3 and many select KPIs such as water withdrawals, energy consumption, waste generation, recycling and supply chain social and environmental responsibility. Data is shared with stakeholders in their annual Living Progress Report. 


Levi Strauss & Co. 
A leader in the global apparel sector, Levi Strauss has been verifying their GHG inventory with SCS since 2012 and reports their inventory to CDP. Their annual verified inventories are used to support their progress toward their Science Based Target Initiatives (SBTI) approved GHG target of a 90% reduction in Scope 1 and 2 emissions by 2025.

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