What is Carbon Credits?

A carbon credit represents one metric tonne of carbon dioxide, or its equivalent in other greenhouse gases, that has been reduced, avoided, or removed from the atmosphere. Each credit is a tradable unit, verified and certified by a recognised standard, that companies or individuals can purchase to offset their own emissions.

The idea behind carbon credits is straightforward: if a company can't yet eliminate all of its own emissions, it can fund emissions reductions elsewhere, effectively balancing out its footprint. A project that plants trees, captures methane from a landfill, or generates renewable energy instead of fossil fuel power can generate credits based on the emissions it prevents or removes, provided that impact is properly measured and verified.

How Carbon Credits Are Created

Carbon credits don't just appear because a project sounds good on paper. They go through a structured process designed to ensure the claimed emissions impact is real:

• Project development: A developer designs a project, such as a reforestation effort, renewable energy installation, or methane capture system, using an approved methodology.
• Baseline calculation: The project must demonstrate what emissions would have occurred without it, this is what "additionality" means in practice.
• Third-party verification: An independent auditor reviews the project's data and methodology to confirm the claimed emissions reduction actually happened.
• Certification and issuance: A recognised standard, such as Verra's VCS, Gold Standard, or Puro.earth, issues credits based on verified results.
• Listing and trading: Once issued, credits can be listed, sold, and eventually retired by the buyer, permanently removing them from circulation once used as an offset.

This process exists because carbon credits only have value if the underlying emissions impact is genuine. A credit representing emissions reductions that would have happened anyway, or that were never accurately measured, undermines the entire system.

Carbon Credits vs. Carbon Offsets: Is There a Difference?

The terms are often used interchangeably, but there's a subtle distinction worth knowing. A carbon credit is the tradable unit itself, the certificate representing one tonne of avoided or removed CO₂. A carbon offset refers to the act of using that credit to counterbalance your own emissions. In practice, once a credit is purchased and retired for this purpose, it becomes an offset. The credit is the instrument; the offset is what it's used for.

Types of Carbon Credits

Carbon credits generally fall into two broad categories, and understanding the difference matters when evaluating credit quality:

• Avoidance/reduction credits: Generated by projects that prevent emissions from happening in the first place, such as renewable energy replacing fossil fuel power, or forest conservation preventing deforestation.
• Removal credits: Generated by projects that actively pull existing CO₂ out of the atmosphere, such as afforestation, biochar production, or direct air capture, and store it long-term.

Removal credits are generally seen as higher quality by many buyers, since they represent a net reduction in atmospheric carbon rather than simply preventing an increase. That said, both categories play a role in a well-rounded carbon market, and pricing reflects these differences, with durable removal credits often trading at a premium.

Voluntary vs. Compliance Carbon Markets

Carbon credits are traded across two distinct types of markets. Compliance markets are government-regulated systems, such as the EU Emissions Trading System, where companies are legally required to hold enough credits or allowances to cover their emissions. Voluntary markets, on the other hand, allow companies to purchase credits on their own initiative, typically to support sustainability goals or net-zero commitments that go beyond legal requirements.

Both markets operate under different rules, pricing dynamics, and oversight structures, but they share the same underlying principle: a credit represents a verified tonne of emissions impact.

How Companies Use Carbon Credits

Carbon credits are typically used as part of a broader emissions strategy, not a standalone solution. Most credible frameworks recommend a "reduce first, offset what remains" approach, meaning companies should prioritise cutting their own emissions before turning to credits to address what's left. This overview of how companies can use carbon credits to achieve net-zero walks through how credits fit into a credible net-zero strategy, rather than serving as a shortcut around genuine reduction efforts.

For companies still building out their internal emissions reduction plan before layering in offsets, this step-by-step guide to building a carbon reduction strategy is a useful starting point.

Buying and Selling Carbon Credits

For buyers, sourcing credits through a reliable carbon trading platform makes it far easier to compare project types, certification standards, and pricing in one place. Given how much variation exists in credit quality across different project categories, that comparison step is essential rather than optional.

If you're a project developer looking to bring verified credits to market, this guide on how to sell your carbon credits walks through the listing and certification process in more detail. And for a broader introduction to how the buying and selling process works end to end, this guide on how carbon trading works covers the core mechanics of credit issuance, listing, and trading.

Working through a well-structured digital carbon marketplace also gives buyers access to a wider range of verified project types, from renewable energy and forestry to newer categories like biochar and blue carbon, making it easier to build a diversified, risk-balanced portfolio.

Evaluating Carbon Credit Quality

Not all carbon credits are created equal, and quality varies significantly based on a few key factors:

• Additionality: Would the emissions reduction have happened without the project's funding and existence?
• Permanence: How long will the carbon reduction or removal actually last, and what's the risk of reversal?
• Verification rigour: Was the project independently audited under a credible, recognised methodology?
• Co-benefits: Does the project deliver additional value, biodiversity protection, community support, improved soil health, beyond carbon impact alone?

Buyers who skip this evaluation step risk purchasing credits that don't hold up to scrutiny, which has become a genuine reputational risk as public and regulatory attention on offset quality continues to grow.

Tracking Carbon Credit Pricing and Market Data

Carbon credit prices vary considerably depending on project type, region, certification standard, and vintage. Teams trying to understand these pricing dynamics often rely on carbon market intelligence tools to track trends across categories. Access to real time global carbon credit pricing is particularly valuable given how quickly demand and pricing can shift, especially for higher-quality removal credits.

The Bottom Line

Carbon credits remain one of the most widely used tools in climate finance, offering a way to fund emissions reduction and removal projects around the world. Their value depends entirely on the integrity of the underlying project, verification, and methodology behind each credit. For anyone building a carbon strategy, sourcing offsets, or developing credit-generating projects, understanding these mechanics thoroughly is the foundation for making credible, defensible decisions in this space.

Frequently Asked Questions

What does one carbon credit actually represent? One carbon credit represents one metric tonne of carbon dioxide, or its equivalent in other greenhouse gases, that has been reduced, avoided, or removed, and independently verified under a recognised standard.

Is there a difference between a carbon credit and a carbon offset? Yes, subtly. A carbon credit is the tradable certificate itself, while a carbon offset refers to using that credit to counterbalance emissions. Once a credit is retired for this purpose, it becomes an offset.

Are removal credits better than avoidance credits? Many buyers consider removal credits, which actively pull CO₂ from the atmosphere, to be higher quality than avoidance credits, which prevent future emissions. Both play a legitimate role, but pricing and demand often reflect this distinction.

How do I know if a carbon credit is high quality? Look for strong additionality, verified permanence, rigorous third-party validation under a recognised standard, and ideally, measurable co-benefits beyond carbon impact alone.

Can any company buy carbon credits? Yes. Voluntary carbon markets are open to any company or individual looking to offset emissions, though credits used to meet legal obligations in compliance markets are typically restricted to regulated entities.

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