As the voluntary carbon market (VCM) continues to grow, the range of carbon credit types and certification standards has grown increasingly diverse. According to the International Emissions Trading Association (IETA), one carbon credit represents one metric ton of carbon dioxide equivalent (tCO₂e) in climate benefit, generated through specific project activities. These activities can be broadly categorized into three types: emission reductions, emission avoidance, and carbon removals.
At first glance, these terms may seem like simple labels. In reality, they reflect fundamental differences in climate impact, maturity, and risk structure. This is why they have become central to how the market evaluates the value of carbon credits. Key questions include: What climate benefit does the credit deliver? How certain and mature is the underlying environmental impact? What risks exist that the expected outcomes may not materialize? And most importantly, how should buyers balance their goals and risk tolerance when choosing among different credit types?
Three Types of Carbon Credits, Three Distinct Climate Impacts
Carbon credits can be grouped into three categories, each representing a different kind of climate benefit.
Emission reductions focus on lowering emissions that already exist. Examples include improving industrial efficiency, reducing fuel consumption, or enhancing energy efficiency. Emissions are still generated, but they are reduced through better technology or management practices.
Emission avoidance prevents emissions that would otherwise occur. Typical cases include renewable energy projects or REDD+ initiatives that protect forests from deforestation and degradation. These projects are built on the idea of a “baseline scenario”—without the project, emissions would have happened.
Carbon removals deliver the most direct climate impact. Instead of reducing or avoiding emissions, they remove carbon dioxide already in the atmosphere and store it. Removals can be divided into nature-based approaches, such as afforestation and reforestation (ARR), soil carbon, mangroves, and seagrass projects; and engineered solutions, such as direct air capture (DAC) or bioenergy with carbon capture and storage (BECCS).
In practice, reductions and avoidance are often grouped together as immediate mitigation measures. Imagine greenhouse gases as water flowing from a tap: reductions and avoidance are like tightening the tap before the basin overflows, stopping additional water from entering. Removals, on the other hand, are like draining the water already accumulated in the basin—removing carbon that has built up in the atmosphere. The former addresses new emissions in the short term, while the latter tackles accumulated carbon for long-term climate stability.
Traditional vs. Emerging Carbon Credit Types
Looking back at the evolution of carbon markets, it is clear why emission reductions and avoidance were considered the core credit types in the early years. During the era of the Kyoto Protocol and the Clean Development Mechanism (CDM), international climate policy focused primarily on reducing greenhouse gas emissions as quickly as possible. Projects such as renewable energy, energy efficiency improvements, and methane recovery offered clear logic, mature methodologies, and relatively manageable costs. As a result, they became the dominant and most easily replicated sources of carbon credits in the early market.
By contrast, credits from carbon removals, which directly target the removal of CO₂ from the atmosphere, have only recently gained prominence. The rise of net‑zero commitments and discussions around residual emissions have highlighted the need for removals to balance emissions that cannot be fully eliminated. International organizations such as the IPCC and the Science Based Targets initiative (SBTi) now explicitly distinguish between reductions and removals in climate pathways. Reductions are seen as the immediate priority, while removals are positioned as the essential tool for achieving long‑term climate goals. This shift in role definition has directly influenced how the market values different types of carbon credits.
Why Do Prices Vary So Widely? Maturity and Risk Explained
In the market, the most visible difference between carbon credit types is price. Generally, emission reduction and avoidance credits are more affordable and actively traded. Renewable energy projects are a good example: the technology is mature, methodologies are well‑established, and the calculation and verification of emission reductions are relatively stable. This makes investment and delivery risks lower, with recent voluntary market prices for renewable energy credits often ranging around USD 2–3 per ton.
That said, these credits are frequently scrutinized for their additionality and baseline assumptions. Additionality asks whether the reductions would have occurred without the project. In some mature markets, national policies already mandate renewable energy use, meaning credits from such projects may not be seen as delivering extra climate benefits. Baseline credibility examines whether the “without project” scenario is realistic—for instance, a REDD+ project in a region with already low deforestation rates may overstate avoided emissions.
Even with these concerns, reduction and avoidance credits remain highly predictable and suitable for supporting short‑ to medium‑term corporate climate commitments.
Carbon Removals: Higher Cost, Greater Challenges, Unique Value
Carbon removal credits typically command significantly higher prices—sometimes several times higher than reduction or avoidance credits. This is not simply because they are “more environmental,” but because they involve fundamentally different technologies and risk structures.
Engineered removals rely on advanced technologies to capture CO₂ directly from the atmosphere and store it for the long term. These solutions are still in early to mid‑stages of maturity, which makes them costly and technically challenging. For example, Climeworks’ Mammoth direct air capture plant in Iceland is designed to remove up to 36,000 tons annually, but in its initial operations has only achieved a few hundred tons—highlighting the gap between laboratory expectations and real‑world performance. Prices for engineered removals often start at hundreds of dollars per ton. Despite limited supply and technical hurdles, their ability to deliver measurable removals with long‑term storage (often marketed as lasting centuries or millennia) is a key selling point. This is why major technology companies such as Microsoft and Google have already signed offtake agreements, providing early funding to scale production and secure future supply.
Nature-based carbon removal relies on ecosystems to absorb and store carbon in biomass and soils. Common approaches include afforestation, reforestation, and land restoration. These credits often carry additional co-benefits, such as enhanced biodiversity, improved soil and water conditions, and creating local employment – aligning with multiple UN Sustainable Development Goals (SDGs).
However, nature-based removals also face constraints and risks. Successful implementation requires close collaboration with local communities, Indigenous peoples, and land users to ensure secure land tenure, fair benefit sharing, and social acceptance; otherwise, they risk conflict or legal disputes. Site selection is limited by climate, soil, and water conditions, making suitable land scarce. Moreover, carbon sequestration takes time — trees must grow for years before storing significant carbon — resulting in slower credit issuance and delayed cash flows. Prices for nature‑based removals vary widely depending on project quality, co‑benefits, and risk profile, typically ranging from USD 15–30 per ton.
Taken together, reductions and avoidance credits remain the mainstream, lower‑cost, high‑volume options, well‑suited for short‑ and medium‑term corporate commitments. Carbon removals, though more expensive and technically demanding, are increasingly seen as strategic procurement targets — indispensable for achieving long‑term net‑zero goals and ensuring the credibility of climate strategies.
Where Is the Market Heading? Strategic Choices on the Path to Net Zero
Recent trends show that the voluntary carbon market is not simply shifting from reductions and avoidance to removals, but rather evolving toward a clearer division of roles. In emerging markets and during the early stages of energy transition, reduction and avoidance credits continue to play an important role in the short to medium term. Carbon removals, meanwhile, are increasingly positioned as the essential tool for achieving long‑term net‑zero goals and addressing residual emissions.
Looking ahead, factors such as the maturity of methodologies, the rigor of verification processes, and the management of long‑term storage risks will become central to how different credit types are evaluated. Choosing carbon credits is, in essence, choosing a climate pathway. Reductions and removals are not substitutes for one another; they represent different strategies suited to different stages, risk tolerances, and climate objectives. The critical question is not “which type is best,” but rather what climate impact each credit truly delivers, and how it fits into the broader decarbonization journey.