How carbon credits actually work
A carbon credit is a tradable certificate representing one tonne of CO₂e either avoided or removed from the atmosphere by a verified project. You offset by buying credits and permanently "retiring" them on a public registry, which cancels them so they can never be reused. The chain runs project → validation → issuance → sale → retirement, with a unique serial number making every step traceable.
Carbon credits sound abstract until you follow one from the ground to your certificate. Here is the whole chain, with nothing skipped.
A project does the work
Everything starts with a project that either avoids emissions or removes carbon. Avoidance projects stop CO₂ that would otherwise be released — protecting a tropical forest slated for clearing, distributing efficient cookstoves so families burn less wood, or building renewable energy that displaces fossil power. Removal projects do the opposite: they pull CO₂ out of the air and store it — through reforestation, biochar, enhanced weathering, or direct air capture.
The distinction matters. An avoidance credit keeps a tonne out of the atmosphere; a removal credit takes a tonne back out. Removals are harder, scarcer, and more expensive, but they are the only way to address emissions that have already happened.
A methodology sets the rules
A project can’t just claim a number. It must follow an approved methodology — a detailed rulebook that defines how much carbon the activity really saves. A good methodology insists on additionality (the climate benefit wouldn’t have happened without carbon finance), a sensible baseline (what would have happened otherwise), and a plan for permanence and leakage (making sure the carbon stays stored and the problem isn’t just pushed elsewhere).
Validation, then verification
An accredited independent auditor — not the project developer — checks the work twice. Validation confirms the project design is sound before it starts. Verification confirms, after the fact and usually every year, that the claimed reductions actually occurred. Only then does a registry issue credits.
The registry issues serialised credits
Registries such as Verra (VCS), Gold Standard, and Puro.earth are the public ledgers of the voluntary carbon market. When credits are issued, each tonne gets a unique serial number recording the project, the vintage (the year the reduction happened), the methodology, and the standard. This serial is what makes a credit traceable and prevents the same tonne being sold twice.
The credit is sold — sometimes several times
Credits trade between developers, brokers, and resellers. Through every transaction the serial number travels with the credit, and the registry records who holds it. This is why a public registry matters: the chain of custody is auditable.
Retirement is the moment it becomes an offset
Here is the step most explanations skip. Buying a credit does not offset anything — the credit could still be resold. Offsetting happens at retirement: the credit is permanently cancelled on the registry, marked with the beneficiary’s name, and removed from circulation forever. Once retired, a credit cannot be transferred, resold, or counted by anyone else.
If a credit hasn’t been retired, no emissions have actually been compensated. Retirement is the whole point.
Where we fit
When you offset with us, you pay once and we run the rest of the chain: we buy verified credits at wholesale, retire them on the public registry on your behalf (under your name, if you choose), and issue you a PDF certificate with a public verification page linking straight to the registry record. You never touch a registry account, and you can check the serial yourself.
That traceability is the difference between funding real climate action and buying a number. Reduce what you can, then retire high-integrity credits for the rest.
What is a carbon credit?
A carbon credit is a tradable instrument representing one tonne of carbon dioxide equivalent (CO₂e) that has been either prevented from entering the atmosphere or actively removed from it by a verified project. Each credit is issued and tracked on a public registry under a unique serial number.
What does it mean to "retire" a carbon credit?
Retiring a credit permanently cancels it on the registry so it can never be sold, transferred, or counted again. Retirement is the step that converts a purchase into a genuine offset — until a credit is retired, no emissions have actually been compensated.
What's the difference between avoidance and removal credits?
Avoidance (or reduction) credits represent emissions that were prevented — for example, protecting a forest that would otherwise have been cleared, or replacing polluting cookstoves. Removal credits represent CO₂ physically taken out of the atmosphere and stored, such as reforestation, biochar, or direct air capture. Removals are generally more durable and more expensive.
How do I know a carbon credit is real?
Look for a registry-traceable serial number. Reputable credits are issued by registries such as Verra (VCS), Gold Standard, or Puro.earth, are independently validated and verified, and can be looked up publicly. Every certificate we issue links to the registry record.
Are carbon credits a substitute for cutting emissions?
No. The credible approach is to reduce your own emissions as much as possible first, then use high-integrity credits to address the remainder. Offsetting is a complement to decarbonisation, not a replacement for it.
