More than 70 carbon pricing instruments now operate worldwide, according to the World Bank's State and Trends of Carbon Pricing report. Yet the two words people use to describe them, carbon credits vs carbon offsets, still get mixed up in boardrooms, sustainability reports and procurement documents. The distinction is simpler than the market makes it look. A carbon credit is a tradable instrument representing one metric tonne of CO2 or its equivalent that was avoided or removed. Carbon offsetting is what you do with it: the practice of retiring credits to compensate for your own emissions.
The Short Answer: One Practice, Two Instruments
The cleanest formulation on the market comes from Terrapass: carbon offsetting is something you do, a carbon credit is what you use to do it.
Strictly speaking:
| Carbon credit | Carbon offset | |
|---|---|---|
| What it is | A tradable certificate for one tonne of CO2e avoided or removed | The act (or the credit used for the act) of compensating your own emissions |
| Where the word shows up | Compliance markets, registries, trading desks | Voluntary climate claims, consumer products, net zero pledges |
| Legal status | Can be a regulated compliance instrument | Almost always voluntary |
In everyday usage, though, the Grantham Research Institute at LSE notes that "offsets" and "carbon credits" are often used interchangeably. People say offsets when they mean voluntary market credits, and credits when they mean government issued allowances. That sloppiness is where most of the confusion, and some of the greenwashing risk, begins.
Why Even the Experts Disagree on These Terms
Read the top explainers side by side and you will find them contradicting each other. One popular guide simplifies the split as offset equals removal, credit equals reduction, with credits created by governments. Morningstar, writing for investors, defines credits as compliance instruments that charge regulated companies per unit of carbon, and offsets as voluntary purchases. LSE shrugs and says the words overlap in practice.
The history explains the mess. The first offsetting deal dates to 1989, when US power company AES worked with the World Resources Institute to compensate for emissions from its coal plants. The carbon credit as a formal instrument arrived with the 1997 Kyoto Protocol, which created mandatory limits for industrialized countries and a trading mechanism between them. Thirty five years of market evolution stacked new meanings onto old words.
At Energaia we deal with this vocabulary daily in carbon credit management work, and the practical fix is to stop arguing about two words and look at three separate layers instead: the market, the claim and the instrument.
Layer 1: The Market. Compliance vs Voluntary
Compliance markets: cap and trade
In a compliance market, a regulator sets a declining cap on total emissions for covered sectors and issues one tonne allowances against it. Companies must surrender allowances equal to their verified emissions or face penalties. The EU Emissions Trading System, established in 2005, is the largest and most studied example and covers roughly 40% of EU greenhouse gas emissions. Similar systems run in the UK, China, South Korea, Kazakhstan and California.
Scale is the headline difference. According to World Bank figures cited by Morningstar, compliance carbon credits regulate around 18% of the world's emissions, while voluntary offsets track far less than 1%.
The voluntary carbon market
The voluntary market is open to anyone. Companies and individuals with no legal obligation buy credits issued by independent standards, chiefly Verra's Verified Carbon Standard and the Gold Standard, to compensate for their own footprint. Once a buyer retires a credit on a registry, it is permanently removed from circulation and cannot be resold.
When someone says "offset," they almost always mean a voluntary market credit. When someone says "credit," ask which market they mean before you sign anything.
Layer 2: The Claim. Avoided Emissions vs Carbon Removal
Every credit represents one of two physically different things:
- Avoidance. A tonne that was never emitted, measured against a baseline scenario. Renewable energy projects, efficiency upgrades and avoided deforestation sit here.
- Removal. A tonne physically extracted from the atmosphere and stored, whether biologically (afforestation), technologically (direct air capture) or thermochemically (biochar).
The market is heavily tilted toward the first category: roughly 90% of credits sold today are for reductions or avoidance, not removals. Guidance is pushing the other way. The Oxford Offsetting Principles argue that traditional avoidance offsetting is unlikely to deliver the types of offsetting needed to reach net zero and advocate shifting to removal projects with long term storage, a direction the Science Based Targets initiative echoes on the road to 2050.
This layer is where our engineering work sits. Energaia's published five step process gasifies local biomass and sewage sludge into clean syngas for dispatchable power and heat, and captures biochar plus verified CO2 offsets from the same plant. The biochar route matters because it is a removal claim, not an avoidance claim: carbon that was on its way back to the atmosphere is locked into a stable solid instead. If you want the plant level mechanics, see our explainer on how waste-to-energy works, and for the credit side specifically, our upcoming guide to biochar carbon credits.
Layer 3: The Instrument. Allowances vs Offset Credits
The third layer is the one most explainers skip, and it resolves the contradiction from earlier. There are actually three distinct instruments hiding behind two words:
| Instrument | Who creates it | What it represents | Typical buyer |
|---|---|---|---|
| Carbon allowance | Government or regulator, under a hard cap | Permission to emit one tonne | Regulated emitters |
| Compliance credit | Regulated entity beating its baseline | A tonne reduced below a required level | Other regulated emitters |
| Offset credit | Project developer, via an independent registry | A tonne avoided or removed by a project | Companies and individuals, voluntarily |
99pt5 compresses this into a useful shorthand: an allowance is a right, an offset is an outcome. A cap and trade allowance permits a future emission. An offset credit certifies that a past reduction or removal actually happened and was verified.
So the popular explainers were not exactly wrong, they were each describing a different instrument with the same two words.
Which One Does Your Organization Actually Need?
If you are a regulated emitter
You have no choice on allowances: compliance users must surrender allowances equal to their verified emissions. Offset credits are an optional extra for residual or value chain emissions, and only where your program's rules permit them.
If you are an unregulated company or SME
The mitigation hierarchy is consistent across SBTi and Oxford guidance: cut your own emissions first, then use high quality offset credits for the residual tonnes you cannot yet eliminate. Prioritize projects with strong additionality and verification, then retire and report.
If you are a municipality or project developer
You may be on the other side of the trade entirely: a supplier of credits, not a buyer. A waste stream that costs money to dispose of today, sewage sludge or agricultural residues, can become a gasification project that produces power, heat, biochar and sellable removal credits. Structuring that revenue stream is exactly what Energaia's carbon credit management service covers: project certification, trading strategy and MRV, and we de-risk the engineering with simulation before any steel is ordered.
The Question That Matters More: Is the Tonne Real?
Whatever you call the instrument, its value stands on four tests, summarized well by 99pt5:
- Additionality. The reduction or removal would not have happened without the credit revenue.
- Permanence. The carbon stays out of the atmosphere, with safeguards against reversal.
- Leakage. The project does not simply push emissions outside its boundary.
- MRV. Monitoring, reporting and verification: independent, transparent and traceable through issuance and retirement.
The market has earned its skepticism. Documented failures include double counting, where both the buyer and the seller of a credit book the same reduction, and projects that never delivered the promised reductions at all. Price adds another warning light: economists put the carbon price needed to meet the Paris Agreement above $50 per ton, and as of 2023 only four compliance markets of the 36 Morningstar tracks priced carbon that high, with no offsets commanding such a premium.
Our position as an engineering institute that runs certification and MRV as a service is blunt: the vocabulary debate is a distraction. A buyer who insists on verified, conservatively quantified tonnes is protected in either market. A buyer who does not is exposed in both. We cover the verification machinery in detail in how carbon credits are verified and examine whether biochar carbon credits are reliable for the removal segment specifically.
FAQ
Are carbon credits and carbon offsets the same thing?
In everyday usage they are treated as synonyms, and even the LSE Grantham Research Institute notes the terms are often used interchangeably. Strictly, a carbon credit is the tradable instrument representing one tonne of CO2e avoided or removed, while offsetting is the practice of retiring credits against your own emissions.
Can individuals buy carbon credits?
Not compliance allowances. Individuals cannot participate in the EU ETS as obligated parties. What individuals and unregulated companies can buy are verified offset credits on the voluntary market, issued through registries such as Verra VCS and the Gold Standard.
What is the difference between avoidance and removal credits?
An avoidance credit represents a tonne that was never emitted compared with a baseline, for example a solar farm displacing fossil power. A removal credit represents a tonne physically extracted from the atmosphere and stored, for example through afforestation, direct air capture or biochar. Roughly 90% of credits sold today are avoidance based, but Oxford and SBTi guidance points toward removals for credible net zero claims.
How much does a carbon credit cost?
There is no single price; it depends on the market and the project quality. As a reference point, economists estimate the carbon price needed to meet the Paris Agreement at above $50 per ton, and as of 2023 only four of the 36 compliance markets tracked by Morningstar priced carbon above that level.
Do carbon offsets actually work?
Only when the underlying tonne is real. Credible credits must demonstrate additionality, permanence, low leakage and robust MRV. Documented failures such as double counting and overstated reductions are why independent verification matters more than what the instrument is called.