How to Read Carbon-Credit Labels

An environment for reviewing issuance data, additional certifications and market eligibility against registry evidence

Carbon-credit registry and trading screens often display several marks beside a single credit: CCP, CORSIA Eligible, CCB, SD VISta or SDG+, among others.

Calling all of them “good-credit certifications” misses their distinct meanings. Some indicate baseline integrity, some eligibility for international aviation compliance, and others benefits for communities or biodiversity.

A standard operates the core rules that issue a credit. A label identifies additional quality, market, environmental or social conditions that the credit meets.

A credit can therefore carry several labels because each answers a different question.

Standards, labels and ratings are different

• A standard or crediting program—such as Verra VCS, Gold Standard, ACR, CAR or GCC—operates methodologies, verification and registry procedures and issues the underlying credit.
• A label or tag is displayed in a registry to show that an issued credit meets additional criteria or can be used in a particular market.
• A rating or score is an opinion from a separate ratings provider that analyzes project risk and quality. It is not the program's issuance decision or a regulator's eligibility approval.

A VCU issued under Verra's VCS, for example, may receive CCB, SD VISta or CCP labels. The VCU is the underlying unit; each label adds separate information. Verra notes that multiple labels may be attached to one VCU. Verra: VCU Labels

What do major labels tell you?

Labels do not substitute for one another. CCP does not automatically make a credit CORSIA-eligible, and CORSIA eligibility does not itself certify community benefits.

CCP is an integrity threshold for the voluntary carbon market

CCP stands for Core Carbon Principles, ten principles developed by the Integrity Council for the Voluntary Carbon Market (ICVCM). They cover governance, registry tracking, transparency, independent verification, additionality, robust quantification, permanence, prevention of double counting and sustainable-development safeguards.

A CCP label requires two levels of approval:

1. The crediting program passes assessments of governance, transparency, registry systems and verification and becomes CCP-Eligible.
2. A specific category and methodology within that program passes assessments of additionality, quantification and permanence and becomes CCP-Approved.

Only eligible credits issued under categories and methodologies that pass both stages can carry the label. “Verra is CCP-Eligible” is not the same as “this VCU has a CCP label.” The actual methodology and conditions must be checked. ICVCM Core Carbon Principles · ICVCM assessment process

CCP is a threshold, not a ranking from first to last. Project type, location, vintage and co-benefits can still differ among CCP-labelled credits.

CORSIA eligibility identifies a permitted use

CORSIA is ICAO's Carbon Offsetting and Reduction Scheme for International Aviation. Airlines cannot use just any credit for CORSIA obligations.

ICAO first evaluates the design and environmental and social integrity of a crediting program. Even within an approved program, conditions apply to project type, vintage, the start of the first crediting period, host-country attestation and exclusions. Registries therefore display “CORSIA Eligible” or similar marks. ICAO CORSIA Eligible Emissions Units

GCC's approval as a CORSIA program does not make every ACC eligible; the same applies to Verra, Gold Standard and ACR. Program approval and eligibility of an individual unit must be distinguished.

The label is less a quality award than a statement that a unit can be used for international aviation compliance under specified conditions.

Article 6 authorization helps prevent double counting

When a mitigation outcome from one country is used by another country or an international scheme, both must not count the same result.

Under Article 6, host-country authorization and a corresponding adjustment to national emissions accounting are important. The official authorization is commonly called a Letter of Authorization (LOA).

An LOA and a corresponding adjustment are not the same. An LOA authorizes a specific mitigation outcome for international purposes such as NDC use or CORSIA and states that the country will complete the relevant accounting. The corresponding adjustment is the later step in which the country records the first transfer in its emissions accounts and Biennial Transparency Report (BTR).

Some registries show the stages separately. Verra can apply Article 6 Authorized after reviewing an LOA and add Article 6 Correspondingly Adjusted after the adjustment is confirmed in the BTR. “Authorized” alone should not be read as proof that the adjustment is complete. Verra Article 6 labels

In the Article 6.4 registry, an A6.4ER authorized for international use becomes an AER (Authorized Emission Reduction); a non-authorized unit is categorized as an MCU (Mitigation Contribution Unit) contributing to the host country's NDC. UNFCCC Article 6.4 registry

Authorization clarifies accounting rights, not the scale of biodiversity or community benefits. Nor is an MCU worthless: it may support the host country's target, domestic carbon-pricing system or results-based climate finance.

Co-benefit labels capture benefits beyond carbon

Carbon projects can affect income, health, energy access, biodiversity and water as well as greenhouse gases. Co-benefit labels assess those outcomes separately.

Verra's CCB label shows whether a forest or land project creates net benefits for climate, communities and biodiversity. SD VISta indicates that independently verified social and environmental benefits occurred during the VCU monitoring period. Verra CCB · Verra SD VISta

Gold Standard displays certified SDG impacts in its registry, connecting mitigation with sustainable-development contributions. Gold Standard Impact Registry

GCC provides additional labels:

• E+: additional certification that the project causes no net environmental harm;
• S+: additional certification that the project causes no net social harm;
• SDG+: certification concerning the number and performance of UN SDGs supported;
• C+: compliance with GCC's conditions for CORSIA market eligibility; and
• CA+: compliance with GCC's Article 6.2 market-eligibility conditions.

GCC issues the underlying mitigation outcome as an ACC; labels are added when selected extra criteria are met. ACC and SDG+ are not synonymous. GCC project standards and labels · GCC program FAQ

Do more labels always mean a better credit?

More labels may mean more verified information, but the number alone does not determine quality.

A credit with several community-benefit labels may still use a methodology unsuitable for the buyer's purpose. Conversely, an industrial-process credit without a co-benefit label may represent highly certain and additional mitigation.

Read each label as an answer to a particular question:

• Does it address the underlying integrity of the reduction?
• Does it identify eligibility for a particular regulation or market?
• Does it confirm host-country authorization and double-counting safeguards?
• Does it verify environmental, social or SDG co-benefits?
• Does it apply to the whole project or only to credits from a specific vintage?

Six elements to check in the registry

Do not rely only on logos shown on a trading screen. Review the official registry in this order:

1. Underlying unit: Which program issued the VCU, ACC, VER or other unit?
2. Project and methodology: Which activity used which calculation rules?
3. Vintage: When did the labelled mitigation occur?
4. Scope of the label: Does it concern integrity, market eligibility, national authorization or co-benefits?
5. Verification evidence: Are independent verification reports and host-country documents available?
6. Use and retirement: Is the unit appropriate for the intended claim, and will it be retired after use?

Credits from one project can carry different labels depending on the issuance and monitoring period. Labels should be checked against serial numbers and issuance batches in the registry, not only against project marketing materials.

DMRV connects the evidence behind labels

For a label to be credible, its supporting data and documents must be traceable. CCP additionality and quantification, CORSIA vintage and host-country conditions, and SDG+ development benefits require different information, but all begin with source data and verification records.

Samton-DMRV manages field data, methodologies, reduction calculations, environmental and social indicators, and verification evidence in one flow. The role of digital carbon data is not only to display which labels a credit has, but to explain the evidence for why those labels can be used.

For the underlying credit structure, see What Is a Carbon Credit?. For the programs that issue the base units before labels are added, continue to Carbon Credit Standards: Their History and Role.