Carbon Credits: What They Are and How They Work
Carbon credits are tradable units that represent a verified reduction or removal of greenhouse gas emissions, typically equivalent to one metric tonne of carbon dioxide equivalent (CO₂e). They can help channel finance toward projects that reduce emissions, remove carbon from the atmosphere or protect natural carbon stores.
Understanding how carbon credits are generated, measured and verified is essential for businesses and project developers seeking to navigate carbon markets and identify credible, high-quality climate projects.
What Are Carbon Credits?
Carbon credits are tradable units that represent one metric tonne of carbon dioxide equivalent (CO₂e) reduced, avoided or removed from the atmosphere, depending on the type of project and methodology used.
Credits can be generated by projects that reduce greenhouse gas emissions or increase carbon removals. Examples include forest and peatland restoration, improved land management, methane reduction, biochar and other activities that can demonstrate measurable climate benefits.
To generate carbon credits, a project must follow an applicable methodology that defines how its climate impact is quantified, monitored and verified. The project establishes a baseline representing what would likely happen without the intervention, allowing the climate benefit attributable to the project to be calculated.
Once the resulting emission reductions or removals have been independently verified according to the applicable standard, credits can be issued through a registry. Each credit typically receives a unique identifier that helps track its ownership and status.
When a carbon credit is used to support a climate claim, it is generally retired in the relevant registry. Retirement prevents that individual credit from being transferred or used again within that registry system.
Carbon credits can therefore create a financial connection between organizations willing to pay for verified climate outcomes and projects capable of generating them. However, the existence of a credit does not automatically guarantee high environmental integrity. Additionality, accurate baselines, permanence, leakage and credible verification are among the factors that determine the quality of the underlying project.
Explore Topics:
- How Do Carbon Credits Work?
- How Are Carbon Credits Generated?
- Carbon Credits vs Carbon Offsets: What Is the Difference?
- How Are Carbon Credits Measured and Verified?
- Types of Carbon Credit Projects
- The Voluntary Carbon Market
- How Businesses Can Use Carbon Credits
- Carbon Credit Quality, Risks and Greenwashing
- How Initiative 14/15 Supports Credible Carbon Projects
How Do Carbon Credits Work?
Carbon credits work by assigning a tradable unit to a measurable and verified greenhouse gas reduction or removal. This allows climate projects to generate finance based on the environmental outcomes they can demonstrate.
The process begins with a project designed to reduce emissions or remove carbon from the atmosphere. Depending on the methodology, this could involve restoring ecosystems, changing land-management practices, capturing methane, producing biochar or using technologies that permanently remove and store carbon dioxide.
A project then establishes a baseline representing the greenhouse gas emissions or carbon removals expected without the project. The climate benefit generated by the intervention is measured relative to this baseline according to an approved methodology.
Project data and calculations are typically reviewed by an independent third-party verifier. Once the required reductions or removals have been verified and the applicable standard’s requirements have been met, carbon credits can be issued and recorded in a registry.
Credits can then be purchased or transferred within the relevant carbon market. When a buyer uses a credit toward a permitted climate claim or objective, the credit is generally retired, preventing that specific unit from being used again within the registry.
The financial value created by carbon credits can help support project implementation and continued operation. However, the effectiveness of this mechanism depends heavily on whether the underlying climate outcomes are additional, accurately quantified and sufficiently durable.
A credible carbon credit therefore represents more than a tonne of CO₂e on paper. It should be supported by a transparent chain from project activity → measurement → verification → issuance → retirement.
How Are Carbon Credits Generated?
Carbon credits are generated through a structured project development and certification process designed to demonstrate that greenhouse gas reductions or removals are measurable, additional and verifiable.
The process typically begins by identifying an activity capable of reducing emissions or removing carbon from the atmosphere. Project developers then select an appropriate carbon standard and methodology that defines how the project’s climate impact should be calculated, monitored and reported.
A baseline scenario is established to estimate what would likely happen without the project. The project must also demonstrate additionality — meaning that the claimed climate benefit would not have occurred in the same way without the intervention or the incentives supporting it.
Once implementation begins, project developers collect data according to a monitoring plan. Depending on the project, this could involve measuring forest biomass, soil carbon, methane emissions, biochar production or other parameters required by the applicable methodology.
The monitored results are documented and typically assessed by an independent validation and verification body. The verifier evaluates whether the project has followed the methodology correctly and whether the reported greenhouse gas reductions or removals are supported by sufficient evidence.
Following successful verification and approval under the relevant carbon standard, credits can be issued into a registry. Each issued credit represents the quantity of verified climate benefit defined by that program and can then be tracked through subsequent transactions and eventual retirement.
The number and quality of credits generated therefore depend not simply on the size of a project, but on its baseline, methodology, additionality, measured performance and verification results.
Carbon Credits vs Carbon Offsets: What Is the Difference?
The terms carbon credit and carbon offset are often used interchangeably, but they can describe slightly different concepts depending on the context in which they are used.
A carbon credit is a tradable unit representing a quantified greenhouse gas reduction or removal, typically equivalent to one metric tonne of CO₂e. Credits are issued through carbon standards and registries after the underlying climate outcome has been quantified and verified according to an applicable methodology.
A carbon offset generally refers to the use of a carbon credit to compensate for greenhouse gas emissions occurring elsewhere. In this sense, the credit is the environmental unit being purchased, while offsetting describes how that unit is used by the buyer.
For example, a verified climate project may generate carbon credits. A company can purchase those credits and, where appropriate under the relevant framework and claims guidance, retire them as part of an offsetting strategy. Once retired, the credits can no longer be transferred or used again within the registry.
The distinction becomes particularly important when communicating climate claims. Purchasing carbon credits does not automatically mean that an organization has neutralized or offset its emissions, and the credibility of any claim depends on factors beyond the purchase itself.
Businesses should prioritize measuring and reducing emissions within their own operations and value chains. Carbon credits can then provide a mechanism for financing additional climate action, particularly where the underlying projects demonstrate additionality, robust quantification, credible verification and durable climate outcomes.
Understanding the distinction between the credit itself and the claim made using it helps organizations communicate more accurately about their participation in carbon markets.
How Are Carbon Credits Measured and Verified?
Carbon credits depend on the ability to demonstrate that the underlying greenhouse gas reductions or removals have actually occurred. This is achieved through systems for measurement, reporting and verification (MRV).
Measurement begins with an approved methodology that defines which data must be collected and how the project’s climate impact should be calculated. The methodology will vary depending on the project type. A forestry project, for example, may measure changes in biomass and carbon stocks, while a biochar project may quantify the amount of carbon stored in the material and its expected durability.
Projects also establish a baseline against which their climate performance can be assessed. Monitoring then takes place throughout the project according to predefined procedures, allowing developers to quantify the reductions or removals achieved during a specific monitoring period.
Measurement can combine several sources of evidence. Depending on the project, these may include field measurements, laboratory analysis, sensors, operational records, satellite imagery and remote sensing. Increasingly sophisticated monitoring technologies can improve data coverage, but they do not remove the need for appropriate methodologies and quality controls.
The resulting data and calculations are documented in monitoring reports and reviewed through independent third-party verification. The verifier assesses whether the project has followed the applicable methodology and whether the reported climate outcomes are supported by sufficient evidence.
Verification is an important safeguard, but carbon credit quality also depends on the assumptions and rules behind the calculations. Factors such as additionality, baseline accuracy, leakage, uncertainty and permanence can materially affect the integrity of a credit.
Robust MRV therefore creates the evidence trail connecting activities on the ground with the carbon credits ultimately issued. The more transparent and scientifically credible that evidence is, the easier it becomes for buyers and other stakeholders to evaluate the quality of the underlying climate outcome.
Types of Carbon Credit Projects
Carbon credits can be generated by a wide range of projects that either reduce greenhouse gas emissions or remove carbon dioxide from the atmosphere. The appropriate project type depends on the activity, location, methodology and carbon standard being used.
Forestry and land-use projects can generate climate benefits by increasing carbon storage or reducing emissions associated with changes in land use. Activities may include afforestation, reforestation, improved forest management and, under certain methodologies, avoided deforestation.
Carbon farming projects focus on agricultural land and land-management practices that can increase carbon storage or reduce greenhouse gas emissions. Examples may include improved soil management, agroforestry, peatland rewetting and other practices that enhance carbon stocks or reduce emissions from soils.
Ecosystem restoration projects can target forests, wetlands, peatlands, mangroves and other ecosystems with significant carbon-storage potential. When designed carefully, these projects may also deliver important benefits for biodiversity, water regulation and ecosystem resilience.
Technology-based approaches are becoming increasingly important. Biochar, for example, converts suitable biomass into a stable carbon-rich material, while direct air carbon capture and storage (DACCS) removes CO₂ directly from ambient air before storing it durably.
Other carbon credit projects focus primarily on reducing or avoiding emissions rather than removing carbon. These can include methane capture, improved waste management, clean cooking and selected energy-related activities where eligible methodologies and crediting programs apply.
These project categories differ significantly in how their climate outcomes are calculated, how long carbon is stored and which risks must be managed. A tonne of CO₂e may be the common accounting unit, but carbon credits are not necessarily equivalent in project quality, durability or environmental impact.
For buyers and project developers, understanding the underlying project type is therefore an important part of evaluating a carbon credit. It provides context for assessing the methodology, monitoring requirements, permanence and wider environmental and social outcomes associated with the project.
The Voluntary Carbon Market
The voluntary carbon market (VCM) enables organizations and individuals to purchase carbon credits outside mandatory emissions trading systems. It connects buyers seeking to finance climate action with projects that generate verified greenhouse gas reductions or removals.
Unlike compliance markets, where regulated entities may be required to surrender eligible units to meet legal obligations, participation in the voluntary carbon market is generally not driven by a regulatory requirement to purchase credits. Buyers instead participate as part of broader climate strategies, sustainability commitments or climate-finance activities.
The market includes several participants. Project developers implement activities that generate climate outcomes, carbon standards and crediting programs establish methodologies and rules, independent bodies validate and verify projects, registries track issued credits, and intermediaries or marketplaces can connect projects with buyers.
Carbon credits can be purchased directly from project developers or through intermediaries and marketplaces. Prices can vary considerably depending on factors such as the project type, location, methodology, durability, vintage, certification and wider environmental or social benefits associated with the project.
The voluntary carbon market has also faced increased scrutiny over the quality of some credits and the claims made by buyers. This has contributed to stronger emphasis on market integrity, transparency and consistent quality criteria for both the supply and use of carbon credits.
Initiatives such as the Core Carbon Principles (CCPs) developed by the Integrity Council for the Voluntary Carbon Market provide a framework for identifying characteristics associated with high-integrity carbon credits. At the same time, guidance for corporate buyers increasingly emphasizes that credits should complement — rather than replace — credible efforts to reduce emissions within a company’s own operations and value chain.
For businesses entering the voluntary carbon market, understanding both the quality of the underlying credit and the appropriate use of that credit is therefore essential. Participation should be based on careful due diligence rather than treating every carbon credit as an interchangeable commodity.
How Businesses Can Use Carbon Credits
Businesses can use carbon credits as part of a broader climate strategy to finance verified climate action beyond their own operations and value chains. When used responsibly, credits can direct private capital toward projects that reduce emissions, remove carbon or protect important carbon stores.
The starting point should be a clear understanding of the company’s own greenhouse gas emissions. Businesses can establish an emissions inventory, set reduction targets and implement measures to reduce emissions across their operations, energy use, supply chains and other relevant activities.
Carbon credits can then complement these efforts by providing additional finance for climate projects. Companies may purchase credits from individual projects, build portfolios across several project types or enter longer-term agreements that provide greater financial certainty for project developers.
Some businesses also use carbon credit procurement to support wider sustainability priorities. Nature-based projects, for example, may combine climate outcomes with benefits for biodiversity, ecosystem restoration, water systems or local communities. These wider outcomes should be evaluated separately and supported by appropriate evidence rather than assumed from the carbon credit alone.
The type of credit selected should reflect the company’s objectives and risk tolerance. Buyers should consider factors such as additionality, permanence, methodology, verification, project location, potential leakage and transparency when evaluating potential projects.
Companies should also carefully consider how they communicate their use of carbon credits. Purchasing or retiring credits does not automatically justify claims such as “carbon neutral” or “net zero.” Climate claims should be consistent with applicable regulations and credible guidance and clearly distinguish between reducing a company’s own emissions and financing mitigation beyond its value chain.
A well-designed carbon credit strategy therefore combines internal emissions reductions, careful project selection, due diligence and transparent communication. This can help businesses contribute additional climate finance while reducing the reputational and environmental risks associated with low-quality credits or misleading claims.
Carbon Credit Quality, Risks and Greenwashing
The quality of carbon credits can vary significantly. Although credits are commonly expressed using the same unit — one tonne of CO₂e — the environmental integrity of the underlying projects is not necessarily equivalent.
One of the most important considerations is additionality. A project should demonstrate that the claimed emission reduction or carbon removal would not have occurred in the same way without the project intervention and the incentives associated with carbon finance. Weak additionality can result in credits that do not represent a meaningful climate benefit beyond business as usual.
Baseline accuracy is another critical factor. If the emissions expected without a project are overestimated, the project may receive more credits than its actual climate impact justifies. Conservative assumptions, appropriate methodologies and transparent data can help reduce this risk.
For projects that store carbon in forests, soils or other biological systems, permanence and reversal risk also require careful consideration. Fires, drought, disease, land-use change or changes in management can potentially release stored carbon back into the atmosphere. Crediting approaches may therefore include monitoring periods, buffer mechanisms or other safeguards to manage reversal risks.
Projects must also consider leakage, where reducing emissions in one location causes emissions to increase elsewhere. In addition, robust registry systems and accounting rules are needed to reduce the risk of double counting or double claiming the same climate outcome.
Carbon credits can create reputational risks when businesses make claims that exaggerate the climate impact of their purchases. Greenwashing can occur when credits are presented as a substitute for reducing a company’s own emissions, when project quality is overstated or when climate claims are unclear or misleading.
High-integrity approaches therefore require due diligence on both sides of the market: the quality of the credit itself and the way it is used. Frameworks such as the Integrity Council for the Voluntary Carbon Market’s Core Carbon Principles provide criteria for assessing credit integrity, while corporate claims should be supported by transparent climate strategies and credible emissions reductions.
For buyers, the key question should not simply be whether a project generates carbon credits, but what evidence supports the climate outcome behind those credits. Understanding the methodology, additionality, permanence, monitoring, verification and potential wider impacts can help distinguish credible projects from lower-quality alternatives.
How Initiative 14/15 Supports Credible Carbon Projects
Developing a credible carbon project requires more than identifying an activity that can reduce emissions or remove carbon. Projects need a clear pathway from initial feasibility and project design to measurement, verification and potential credit generation.
Initiative 14/15 works with landowners, businesses and project partners to identify opportunities where climate action can be connected to measurable environmental outcomes and long-term land management. This includes assessing project conditions, potential carbon benefits and the wider ecological context in which a project operates.
An important part of project development is determining whether an appropriate methodology and carbon standard are available. Initiative 14/15 can help evaluate these requirements and support the development of the data, monitoring approaches and documentation needed to build a credible project foundation.
For land-based projects, carbon outcomes should also be considered alongside the wider landscape. Forests, agricultural land, wetlands and peatlands can provide important benefits for biodiversity, water systems and ecosystem resilience, creating opportunities to design projects that support both climate and nature objectives.
Where carbon credits form part of the financing model, Initiative 14/15 focuses on environmental integrity, transparent measurement and credible project development. The objective is not simply to maximize the number of credits generated, but to develop projects where the underlying climate outcomes can withstand scrutiny.
By combining expertise in carbon, biodiversity and nature-based project development, Initiative 14/15 helps organizations move from an initial opportunity toward credible, measurable and financeable climate projects.
Frequently Asked Questions About Carbon Credits
A carbon credit is a tradable unit representing a quantified greenhouse gas reduction or removal, typically equivalent to one metric tonne of carbon dioxide equivalent (CO₂e). Credits are issued after the underlying climate outcome has been measured and verified according to an applicable methodology and crediting program.
Carbon credits connect measurable climate outcomes with finance. Eligible projects reduce greenhouse gas emissions or remove carbon, quantify the results according to an approved methodology and undergo verification before credits can be issued and tracked through a registry.
Carbon credits are generated through projects that meet the requirements of a carbon crediting program and methodology. The process typically includes establishing a baseline, demonstrating additionality, monitoring the project, quantifying climate outcomes, independent verification and credit issuance.
A carbon credit is the tradable unit representing a quantified climate outcome. Carbon offsetting generally describes the use of a carbon credit to compensate for emissions occurring elsewhere. The terms are often used interchangeably, but the distinction can be important when making climate claims.
Depending on the applicable methodology, projects can include forestry, carbon farming, peatland restoration, methane reduction, biochar and engineered carbon removal. Different project types have different requirements for measurement, additionality, permanence and verification.
The voluntary carbon market allows businesses and other buyers to purchase carbon credits outside mandatory emissions trading systems. It can channel private finance toward climate projects, although the quality and characteristics of available credits can vary significantly.
Important quality considerations include additionality, baseline accuracy, robust quantification, independent verification, permanence, leakage and transparent accounting. Buyers should evaluate the underlying project and methodology rather than assuming that all carbon credits are equivalent.
Purchasing carbon credits does not automatically make a business carbon neutral. Companies should prioritize reducing emissions within their own operations and value chains and carefully assess applicable regulations and credible claims guidance before making carbon-neutrality or similar environmental claims.
When a carbon credit is retired, it is permanently designated as used within the relevant registry and can no longer be transferred or retired again there. Retirement helps prevent the same individual credit from being repeatedly used by different buyers.
Initiative 14/15 helps landowners, businesses and project partners evaluate and develop credible carbon projects. This can include project feasibility, methodology assessment, monitoring approaches and integrating carbon outcomes with wider biodiversity and nature objectives.
Develop Credible Carbon Projects
Carbon markets can create new opportunities to finance measurable climate action, but successful projects require robust methodologies, reliable data and credible environmental outcomes.
Initiative 14/15 helps landowners, businesses and project partners evaluate carbon opportunities and develop projects built around measurement, transparency and long-term environmental integrity.
Whether you are exploring carbon farming, ecosystem restoration or other carbon project opportunities, we can help you assess the potential and define the next steps.