Carbon credits can fund emissions reductions or removals, but the tonne alone does not tell a buyer whether the project is additional, durable, correctly measured or suitable for a public claim. Use this guide to move from the basic mechanics to quality, price, retirement evidence and market eligibility.
Choose the route that matches the decision in front of you. New readers can learn how credits work. Buyers can compare evidence and price. Market readers can follow current signals. Companies preparing a claim can check what their wording requires.
Choose where to start
Browse the complete carbon credit guide directory
All carbon credit guides
| Guide | Best for | What it helps you understand |
|---|---|---|
| How carbon credits work | First-time readers | The difference between removals, reductions, avoidance claims, registries, retirement and offsetting. |
| Carbon credit quality checklist | Buyers and sustainability teams | Additionality, permanence, leakage, baselines, monitoring, verification and claims risk. |
| Carbon credit retirement evidence | Buyers, brokers and claims reviewers | How registry records, serial numbers, vintage, beneficiary details and retirement wording support a defensible claim trail. |
| Carbon credit vintage explained | Buyers comparing age, price and eligibility | Why the year behind the credited climate outcome affects price, claims, registry evidence and CORSIA eligibility. |
| Carbon credit prices in 2026: project ranges | Market watchers and procurement teams | Why credit prices vary by project type, vintage, standard, quality and buyer demand. |
| Carbon removal credits explained | Buyers and net zero teams | How removals differ from avoidance and reduction credits, why durability matters and what claims buyers should avoid. |
| EU carbon farming certification 2026 | Land managers, schemes and carbon buyers | What the first CRCF methods cover, how schemes gain recognition and why a methodology is not yet a certified unit. |
| Frontier carbon removal explained | Market watchers and corporate buyers | How advance market commitments, offtakes, contracted tonnes and delivered removals differ. |
| Carbon prices guide: live price map | Buyers who want live pricing context | Auto-updating TCW (The Carbon Workbench) price guide, project-type ranges, buyer notes and links to deeper price analysis. |
| Carbon Market Intelligence Dashboard | Market watchers and carbon teams | Source-backed market signals, dated price lanes, Article 6 checks, CORSIA context, removal delivery and claims-discipline indicators in one place. |
| Carbon market update July 2026 | Market watchers and carbon teams | Explains what the July tracker data says about carbon prices, CORSIA, Article 6, voluntary credit evidence and removals. |
| CORSIA credit prices | Airlines, brokers and aviation-linked buyers | Why eligible emissions units are priced differently from ordinary voluntary credits and what documentation buyers should check. |
| CORSIA eligible carbon credits | Airline buyers, brokers and project developers | Which programme, vintage, authorisation and double-counting checks matter before a credit is treated as aviation-eligible. |
| CORSIA Phase 1 | Aviation market watchers | How the 2024 to 2026 phase affects demand, supply and the transition into Phase 2. |
| CORSIA and the voluntary carbon market | Voluntary-market buyers and analysts | Why aviation eligibility can influence credit quality expectations beyond airlines. |
| Gold Standard vs Verra vs Puro.earth | Buyers comparing standards | How major registries differ and why methodology choice matters. |
| Voluntary carbon market in 2026 | Carbon market analysts | Market recovery, buyer confidence, quality segmentation and demand trends. |
| ICVCM and CCP labels explained | Buyers screening credit quality | What Core Carbon Principles labels signal, what they do not prove and why project-level due diligence still matters. |
| VCMI Claims Code explained | Companies making public claims | How carbon credit claims differ from credit quality and why claim wording needs its own evidence. |
| Climate claims hierarchy | Companies choosing claim wording | How measured emissions, reductions, contributions, offsetting, carbon neutral, net zero and carbon negative claims need different evidence. |
| Article 6 of the Paris Agreement | International credit buyers and market watchers | Why host-country authorisation, corresponding adjustments and double counting affect carbon credit use. |
| Corresponding adjustments explained | Buyers checking Article 6 or CORSIA evidence | How host-country accounting stops one mitigation outcome being counted twice. |
| Carbon offsetting for UK businesses | SMEs and operators | When offsetting is useful, when it creates greenwashing risk and how to phrase claims carefully. |
| CORSIA guide | Aviation and compliance readers | How aviation demand and eligible emissions units affect carbon credit quality and supply. |
| Carbon credits as an investment | Investors | Why carbon credit exposure is risky, specialist and not the same as buying normal funds. |
What makes carbon credits difficult?
Carbon credits look simple on the surface: one credit usually represents one tonne of carbon dioxide equivalent. The hard part is proving that the tonne is real, additional, durable, measured properly and not claimed twice. That is why carbon credit quality depends on the project, methodology, baseline, monitoring data, verification body, registry record and the wording of the buyer's public claim.
The market is also split between very different credit types. A cookstove credit, forestry credit, renewable energy credit, biochar removal credit and direct air capture removal credit can all be described as carbon credits, but they do not carry the same risk profile, cost, durability or buyer use case.
How to use these carbon credit guides
New readers should start with the basic explainer, then move to the quality checklist. Buyers should read the offsetting and claims guides before looking at prices, because the claim determines the minimum evidence needed. Project developers should start with standards, methodology and eligibility questions before assuming demand. Investors should treat carbon credits as specialist exposure with policy, liquidity, quality and pricing risk.
Price is useful only after the buyer understands what is being priced. A low-cost avoidance credit, a nature-based removal, a durable engineered removal and a CORSIA (Carbon Offsetting and Reduction Scheme for International Aviation) eligible unit may all have different buyer pools, risks and evidence requirements. Comparing them only by tonne price can be misleading.
Buyer decision path
A good carbon credit purchase starts with the claim, not the price. A company making an internal climate contribution can use a wider range of project types than a company making a public carbon neutral or net zero-related claim. Once the claim is clear, buyers should compare project type, standard, methodology, vintage, retirement evidence and quality risk.
| Decision | Why it matters | Useful guide |
|---|---|---|
| Claim type | Determines the minimum quality threshold and wording risk. | Climate claims hierarchy |
| Credit type | Reduction, avoidance and removal credits carry different risk profiles. | Carbon removal credits explained |
| Price range | Cheap credits can be legitimate, but low price often signals higher scrutiny. | Carbon credit prices guide |
| Vintage | The year behind the credited outcome can affect claim fit, pricing and CORSIA eligibility. | Carbon credit vintage explained |
| Quality evidence | Additionality, permanence, leakage and retirement records support credibility. | Carbon credit quality checklist |
| Retirement evidence | Registry records, serial numbers and beneficiary details show which units were taken out of circulation. | Carbon credit retirement evidence |
| Eligibility | Aviation and compliance-style use cases may require specific eligible units. | CORSIA credit prices |
| Article 6 accounting | International claims may require host-country authorisation and corresponding adjustment evidence. | Corresponding adjustments explained |
Common buyer mistakes
- Starting with the cheapest price before defining the claim.
- Treating all registries, methodologies and project types as equivalent.
- Ignoring vintage, retirement status and double-counting risk.
- Using offsets to imply emissions have been reduced when they have not.
- Buying credits without keeping retirement records and source documents.
- Assuming CORSIA eligibility or Article 6 authorisation without checking the specific unit.
Priority questions for buyers
- Is the credit a reduction, avoidance or removal?
- Which registry and methodology issued the credit?
- What evidence supports additionality?
- How is permanence handled?
- Could leakage reduce the climate benefit?
- Has the unit already been retired or claimed?
- Is the public claim reduction-led, contribution-led or offset-led?
- Does the credit need CORSIA, Article 6 or other eligibility?
Live price guide via The Carbon Workbench
Useful source links
- ICVCM Core Carbon Principles
- VCMI Claims Code of Practice
- ISO 14068-1 carbon neutrality
- Oxford Principles for Net Zero Aligned Carbon Offsetting
Bottom line
Carbon credits can be useful, but only when they are treated as a quality-sensitive instrument rather than a commodity. Start with the climate claim you want to make, then work backwards to the evidence required, the price you can defend and the retirement record you can show.