How to choose high-quality carbon offset projects for your business
Updated: Sep 22
Carbon offsetting can be a valuable tool within a wider decarbonisation strategy, helping businesses take responsibility for emissions that are difficult to eliminate. However, not all offsetting projects deliver the same quality or level of climate benefit.
As the range of carbon projects expands, encompassing an increasing number of technologies and methodologies, it’s becoming more important for organisations to understand the impact each project is designed to deliver. Before choosing to fund a project, there are a number of quality criteria to assess.
In this article we explore five key quality criteria which can help you make informed decisions when choosing projects for your carbon offset portfolio.
Start with additionality
One of the first questions to ask is whether a project is additional. In simple terms, would the emissions reduction or removal have happened without the revenue generated from carbon credits?
If a project would have gone ahead anyway, buying its credits may not be creating an additional climate benefit. Look for evidence that funding from carbon offsetting is necessary for the project to exist.
For example, a wind farm that was already financially viable and would have been built without funding from carbon offsetting is unlikely to be additional. If funding from carbon offsetting is needed to make a new project financially viable, there is a stronger case for additionality.
On the other hand, tech-based CDR solutions such as Direct Air Capture and Storage are good examples of carbon finance enabling carbon removals with no commercial incentive, making them highly additional.
Look at how carbon is measured
To understand whether an offsetting project is delivering what it claims, look at how its emissions reductions or removals are measured, reported and independently checked. This is known as Monitoring, Reporting and Verification (MRV).
Good MRV should give you confidence that the project's claimed climate impact is based on reliable data and an appropriate methodology. Look at what is being measured, how often data is collected, how the results are calculated and whether they are independently verified.
For example, a reforestation project might use satellite data to track changes in forest cover alongside field measurements to estimate how much carbon is being stored. An independent verifier can then assess whether the project's monitoring and calculations support the emissions removals it is reporting.
Permanence
Permanence refers to how long a project is expected to keep carbon stored and out of the atmosphere.
With nature-based projects such as reforestation, there is a higher chance that the stored carbon will be released back into the atmosphere much sooner than a tech-based solution such as biochar or direct air capture with geological storage. This could occur as a result of wildfires, drought, or land use change (leakage).
Because of this, some standards and buyers account for permanence risk when assessing or pricing carbon credits. Credits from more durable carbon removal projects, such as direct air capture, enhanced weathering and some biochar projects, may command a premium because they offer longer-term carbon storage and lower reversal risk.
Transparency
Every project should have all of the relevant documentation available and accessible, including methodology, evidence, and verification process.
It’s also important to look at the project’s wider environmental and social impact. There should be measures in place to address any potential risks to local communities, including land rights and impacts on ecosystems. A project must demonstrate that the people who are directly affected by its existence have been consulted and involved in the process.
Without the right safeguards in place, a carbon offsetting project can carry unintended consequences: from damaging ecosystems through monoculture plantations, to affecting the livelihoods of local farmers due to land use changes. In contrast, community-driven projects combine environmental benefits with positive social outcomes, such as developing projects alongside locals and providing training and skills that support local communities.
Understand the economics and the drivers behind the price
Carbon credits can vary significantly in price with different project types having different costs, levels of durability and supply. In the voluntary carbon market, there has been a tendency to label lower prices with lower integrity when, in reality, price does not inherently correlate with quality.
A high-quality portfolio doesn’t necessarily mean buying fewer credits at a higher price. Some methodologies can deliver credible emissions reductions or removals at scale, creating a high supply of credits without driving project costs up. In these cases, a lower price can reflect the economics of the project rather than a compromise in quality. This means organisations can sometimes support a greater volume of credible climate solutions without exceeding their budget.
The price of a credit is only really meaningful when it’s considered in context. For example, a REDD project should be compared with other forest protection projects using the same or a similar methodology, rather than with a technology-based carbon removal project with a very different cost structure. If a credit is significantly cheaper than comparable projects, it’s worth understanding why. This could come down to factors such as economies of scale or market supply, but if there’s no clear explanation, the difference should raise some questions.
Ultimately, the goal isn’t to buy the cheapest credits or spend more simply to signal quality. By considering the credibility of individual projects, the types of solutions being supported and how they are priced within their respective markets, organisations can build a high-quality portfolio while making effective use of their budget.
Your guide to evaluating carbon projects
High-integrity carbon offsetting isn’t about ticking one box. Additionality, measurement, permanence, transparency and safeguards all need to be considered as part of due diligence, with the level of scrutiny depending on the type of project.
Our guide goes deeper into these criteria and provides a practical framework for evaluating carbon projects, so that you can reduce risk for your business and ensure your investment is having a real impact
Download the full report: How to choose high-quality carbon offsetting for your business
Carbon offsetting FAQs
Should businesses use carbon offsets to reach net zero?
Offsetting shouldn't be a business's first step towards net zero, nor a substitute for reducing its own emissions. Credible net zero strategies prioritise cutting emissions across operations and supply chains as far as possible. Carbon credits then play a supporting role, addressing the residual emissions that remain genuinely difficult or currently impossible to eliminate. Used this way, offsetting is one part of a wider decarbonisation plan, not a shortcut around it.
How can I tell if a carbon offset is legitimate?
Legitimacy comes down to evidence, not marketing claims. A credible project will have transparent documentation showing exactly how its climate impact is calculated, independent third-party verification against a recognised methodology, and clear records of how credits are issued and retired. It's also worth checking that the project addresses additionality and permanence risks, and that it's registered with a reputable standard such as Verra or Gold Standard. If a provider can't answer these questions clearly, that's a red flag in itself.
Why are some carbon credits more expensive than others?
Price largely reflects the rigour and risk profile behind a credit. Projects with robust monitoring, independent verification and strong permanence, such as engineered carbon removal, typically cost more to run and carry lower risk of the impact being overstated or reversed. Lower-cost credits often come from projects with lighter oversight, shorter-term storage, or greater uncertainty around additionality. In carbon markets, price and quality are linked, which is why cost alone is a poor basis for choosing a project.