If you’ve heard companies announce they’re “carbon neutral” or “offsetting their emissions,” carbon credits are usually the machinery behind the claim. But what are carbon credits, exactly — and do they actually help the climate?
In this guide, we’ll break down what a carbon credit is, how carbon markets work, what credits cost in 2026, and what separates a credible credit from a worthless one.
What Are Carbon Credits?
A carbon credit is a tradable certificate representing one metric tonne of carbon dioxide (CO2) — or its equivalent in other greenhouse gases — that has been reduced, avoided, or removed from the atmosphere.
Think of it as a receipt for climate action. When a project verifiably keeps a tonne of CO2 out of the atmosphere — by protecting a forest, capturing methane from a landfill, or pulling carbon directly out of the air — it can be issued a credit. A company or individual can then buy that credit to compensate for a tonne of their own emissions. Once used this way, the credit is “retired” so it can’t be sold or counted twice.
The logic is simple: the atmosphere doesn’t care where a tonne of CO2 is cut. Credits let money flow from emitters who can’t cut fast enough to projects that can cut cheaply and quickly.
How Do Carbon Credits Work?
The life of a carbon credit follows five steps:
- A project is developed — a wind farm, a reforestation effort, a clean cookstove program, a direct air capture plant.
- The climate benefit is measured against a baseline: how much CO2 would have been emitted without the project?
- An independent auditor verifies the numbers under a recognised standard such as Verra (VCS) or Gold Standard.
- Credits are issued into a registry — one credit per tonne — each with a unique serial number.
- A buyer purchases and retires the credit, claiming the tonne against their own footprint.
The registry system is what prevents double counting: a retired credit is permanently marked as used.
Compliance vs. Voluntary Carbon Markets
Carbon credits trade in two very different worlds, and the distinction matters.
Compliance markets
These are created by law. Governments cap the emissions of polluting industries and force them to hold allowances or credits for every tonne they emit. The EU Emissions Trading System (EU ETS) is the largest example, and schemes now exist from California to China to India. According to the World Bank, there are around 80 carbon pricing instruments in operation, covering roughly 28% of global emissions.
Voluntary carbon markets (VCM)
Here, no law forces anyone to buy. Companies purchase credits voluntarily to meet net-zero pledges or ESG goals. The voluntary market was worth roughly €2.5 billion in 2025, with forecasts suggesting growth toward €15 billion by 2035 as demand for high-quality removals accelerates.
The two worlds are starting to converge. Under Article 6 of the Paris Agreement, countries can now trade emissions reductions between themselves, and the UN’s new Paris Agreement Crediting Mechanism (PACM) — which hit key milestones at COP30 in late 2025 — is expected to bring more transparency and integrity to international credit trading. The EU has even proposed allowing high-quality international credits to count for up to 3% of its 2040 emissions-reduction target.
How Much Does a Carbon Credit Cost in 2026?
There is no single “price of carbon.” In the voluntary market, prices in 2026 range from around €12 to over €1,000 per tonne depending on project type, quality rating, and region. Some current benchmarks:
| Project type | Typical price per tonne (2026) |
|---|---|
| REDD+ (avoided deforestation) | ~$6 |
| Afforestation / reforestation (ARR) | ~$22 |
| Biochar | ~$177 |
| Direct air capture (DAC) | $500+ |
Quality drives price more than anything else: highly rated credits (A–AAA) average around $14.80 per tonne, while low-rated credits trade for as little as $3.50. A typical corporate buyer building a blended portfolio pays somewhere between €25 and €80 per tonne.
Why the huge spread? Cheap credits usually come from projects where the climate benefit is harder to prove or less permanent. Expensive credits — like direct air capture — offer durable, measurable removal but at industrial cost.
Carbon Credits vs. Carbon Offsets: What’s the Difference?
The terms are often used interchangeably, but there’s a useful distinction. A carbon credit is the tradable instrument itself — the certificate for one tonne. A carbon offset describes what you do with it: using the credit to compensate for your own emissions. In practice, “offset” usually refers to voluntary-market credits, while compliance markets speak of allowances and credits.
Do Carbon Credits Actually Work?
Honest answer: it depends on the credit.
