Understanding CO₂ compensation correctly: How compensation projects work
Corporate Sustainability
The global economy is under enormous pressure to transition to a climate-neutral future. While companies today are taking various measures to avoid and reduce emissions, it is becoming increasingly clear that reduction alone will not be sufficient to limit global warming to below 2 °C. Various scientific institutions – including the IPCC and the Royal Society – point out that even with ambitious reduction strategies, unavoidable emissions remain. This is where CO₂ compensation comes into play: It aims to help balance remaining emissions and simultaneously finance climate protection projects worldwide.
But compensation is not the same as compensation. The quality of the projects determines whether a genuine contribution to climate protection is made – or whether a company ends up financing ineffective measures. This article explains how CO₂ compensation works, what types of projects exist, why Carbon Removal is becoming increasingly important, and what companies need to pay attention to when they want to utilize CO₂ certificates.
The most important points at a glance
Reduction first: Compensation is only intended for unavoidable residual emissions.
Quality matters: Only additional, permanently stored, and independently verified emission reductions without double counting are effective.
Offset vs. Removal: Offset prevents new emissions; Removal removes existing CO₂ – increasingly indispensable for net zero.
Large quality differences: Strict standards and verified projects are crucial for ensuring real climate benefits.
Reduction before Compensation
In principle, the most important measure for companies remains the reduction of emissions along the entire value chain. Without massive reductions, the goals of the Paris Climate Agreement cannot be achieved. The Science Based Targets Initiative (SBTi) provides clear guidelines: Companies must first reduce those emissions that are avoidable or modifiable – for instance, through more efficient processes, low-emission energies, circular design, or changes in the supply chain.
Only when a company has exhausted all realistic reduction potentials does CO₂ compensation come into play. However, according to scientific assessments, this will remain necessary: processes in the cement or steel industries, parts of agriculture, and global transport chains cannot be made completely emission-free. It is precisely these "residual emissions" that are meant to be offset by high-quality compensation projects.
How CO₂ Compensation Works
A central physical principle allows compensation to happen at all: For the greenhouse effect, it does not matter where on Earth CO₂ is emitted or saved. Greenhouse gases are distributed globally in the atmosphere, and their climate effect is independent of the place of origin.
Companies can therefore offset emissions by financing projects that avoid, reduce, or remove greenhouse gases from the atmosphere. For every verified ton of CO₂ saved or bound by a project, a certificate is issued. Companies purchase these certificates and "retire" them; this prevents the same emission reduction from being counted multiple times.
However, a prerequisite for this logic is that companies calculate their emissions realistically and completely. Especially in aviation, it becomes clear how complex this can be: In addition to pure CO₂ emissions, so-called non-CO₂ effects – such as contrails and altered cloud formation – have a strong climate impact.
How the Voluntary Trading of CO₂ Certificates Works
In addition to the legally regulated emissions trading systems, which primarily affect large industrial facilities, energy suppliers, or aviation, there exists a separate voluntary market where companies can offset emissions without being obligated to do so. This so-called Voluntary Carbon Market follows clear processes designed to ensure that every issued certificate represents a demonstrable climate impact. The process always begins at the project level: A climate protection project must demonstrate how much greenhouse gas emissions it can save or remove. These savings are verified by independent verification organizations. Only once this proof is provided may certificates be issued – each one representing a ton of CO₂ that the project has reduced or removed in a real and additional manner.
After verification, the certificates are recorded in public registers maintained by independent institutions. These registers ensure transparency: They show which certificates exist, who owns them, and whether they have already been used. When a company wishes to offset emissions, it acquires the corresponding certificates and then "retire" or "write off" them. This retirement is a critical step, as it prevents double counting: A certificate that has been retired once cannot be traded or counted again. Only with this write-off is a certificate officially considered used – and the corresponding emission reduction is permanently attributed to a single company.
This process – from verification through registration to final retirement – is essential for CO₂ compensation to function reliably. It creates verifiable transparency and gives companies the assurance that the certificates they have purchased actually contribute to measurable global emission reductions.
The Difference Between Carbon Offset and Carbon Removal
Those wanting to compensate CO₂ quickly encounter two fundamental mechanisms: Carbon Offset and Carbon Removal. Both contribute to climate protection, but they work entirely differently – and are relevant for long-term strategies in different ways.
In Carbon Offset, emissions are prevented that would otherwise be additional. This can involve the protection of existing forests that would be deforested without funding, the expansion of renewable energies, or projects that replace energy-intensive practices with more efficient alternatives. Offset projects primarily work preventively: They prevent additional burdens but cannot undo emissions that have already been emitted.
In contrast, Carbon Removal actively removes CO₂ from the atmosphere and stores it long-term. This can be achieved, for instance, through Direct Air Capture, carbon binding in the soil, or certain mineral processes, as well as through long-term afforestation and renaturation. Removal projects hold special significance because they offset historical emissions and are essential for genuine net zero targets. The SBTi therefore requires companies to cover a growing share of their compensation through Removal projects over the long term.
What Types of Compensation Projects Exist
The variety of climate protection projects is large and includes both nature-based and technology-based approaches. Nature-based projects – such as forest protection or afforestation – are relatively well-known and often offer additional ecological benefits beyond CO₂ binding. However, they can also be more susceptible to risks such as forest fires, droughts, or other influences, as CO₂ storage can be naturally limited. Less known approaches include regenerative agriculture or the restoration and protection of peatlands or coastal ecosystems like mangroves, which can bind particularly large amounts of carbon in the soil or substrate.
Technological projects are currently developing particularly dynamically. Biochar projects can produce carbon through pyrolysis of organic materials and store it in the soil for decades to centuries. Mineral binding processes (e.g., solidified carbon or mineralization) offer the opportunity to fix CO₂ long-term and potentially very permanently. Processes for direct CO₂ removal from the atmosphere (e.g., Direct Air Capture) also fall under these technology-based approaches: They function independently of natural ecosystems and are considered particularly predictable regarding the amount and duration of storage.
Both project types have their merit: Nature-based solutions often provide additional benefits for biodiversity, soil fertility, water management, and local ecosystems – thereby often delivering co-benefits. Technological projects, on the other hand, ideally offer long-term stability and permanent CO₂ removal. Many strategies therefore combine both approaches to secure both immediate ecological benefits and long-term climate impact.
Why High-Quality CO₂ Certificates Are Crucial
The biggest challenge in CO₂ compensation lies not in the mechanism itself, but in the quality of the projects. In recent years, numerous programs have been critically scrutinized because the promised emission savings turned out to be overestimated or not durable. Multiple scientific analyses show that a substantial portion of the globally available certificates does not produce the expected climate benefits.
Therefore, quality assessment plays a central role. A high-quality CO₂ certificate is based on projects that have been comprehensively, transparently, and independently evaluated. A simple registration with established standards like the Gold Standard or the Verified Carbon Standard is merely a first step but does not guarantee effectiveness. Modern audit processes analyze projects based on numerous criteria: whether the savings are indeed additional, whether the CO₂ is stored permanently, how robust the project is against risks, and whether it is reliably monitored.
Furthermore, high-quality projects do not only consider the pure CO₂ balance. They also examine what ecological and social effects a project brings with it – such as whether it protects biodiversity, supports local communities, or contributes to the United Nations' sustainability goals. This holistic view not only increases credibility but also stabilizes climate protection long-term.
For companies, this means: Those who use high-quality certificates minimize the risk of later corrections or criticism and can communicate climate strategies transparently and solidly. At the same time, it ensures that funds actually arrive where they can create climate impact.
The market today offers specialized platforms that do not just list projects but carefully assess them based on extensive criteria. Some of these providers utilize hundreds of data points, incorporate independent ratings from external analysis services, and accept only a small fraction of the globally available projects. One example is Senken, which evaluates both nature-based and technology-based solutions, thereby providing companies access to rigorously verified certificates. Such platforms can help companies make informed decisions and establish compensation on a scientifically solid foundation.
What Quality Criteria Must a Compensation Project Meet
For CO₂ compensation to genuinely contribute to climate protection, projects must meet four fundamental quality requirements that are enshrined in international standards. Perhaps the most important of these is the so-called Additionality. It describes that a project is only a real climate contribution if it would not exist without the financing from compensation funds. If a project is being implemented anyway – for instance, because it is economically profitable or legally required – then no additional benefit for the climate arises. The emission reduction would also have occurred without the purchase of a certificate, and a certificate would thus have no real value.
Equally central is the exclusion of double counting. Every avoided or removed ton of CO₂ may only be counted once – either to a company or a state, but never to multiple actors simultaneously. Double counting would mathematically multiply the climate effect, even though atmospherically only a single effect has occurred. Especially since many climate protection projects take place in countries that pursue their own climate goals, the clear attribution of emission reductions is indispensable.
A third criterion concerns durability. Especially nature-based projects like afforestation or peatland protection often store carbon for decades but are subject to risks such as fires, droughts, or changes in land use. If bound carbon is released later, the previously achieved climate effect is lost. Durability therefore does not mean absolute certainty but a careful risk assessment and appropriate mechanisms to make long-term storage as reliable as possible.
Finally, regular verification plays an important role. Projects must transparently document for many years whether the planned emission reductions have actually occurred. Independent auditing bodies check whether measurements were correctly conducted, whether assumptions are realistic, and whether the climate impact continues to match the originally promised values. This continuous oversight protects against negative developments and ensures that climate protection is not only guaranteed at the beginning but remains in place over the long term.
Frequently Asked Questions about CO₂ Compensation
How does CO₂ Compensation work fundamentally?
Companies offset emissions by financing certified projects that avoid, reduce, or remove CO₂. A tradable certificate is created for every verified ton.
When is compensation sensible – and when is it not?
Compensation is only intended for unavoidable residual emissions. All realistic reduction measures must be exhausted beforehand.
What differentiates Carbon Offset from Carbon Removal?
Offset projects prevent additional emissions, whereas Removal projects actively remove CO₂ from the atmosphere. For net-zero targets, removals are becoming increasingly important in the long term.
How can one recognize high-quality CO₂ certificates?
By clear additionality, exclusion of double counting, permanent storage, and regular independent verification.
Why are many certificates criticized?
Studies show that numerous projects overestimate their impact, are inadequately monitored, or only store CO₂ temporarily.
Are nature-based or technological projects better?
Both have their advantages: Nature-based projects offer co-benefits for ecosystems, while technological solutions often enable particularly durable CO₂ removal.
What role do platforms or standards play?
Standards like Gold Standard or Verra, as well as platforms with strict verification processes, help companies select effective projects and minimize risks.
Sources:
Royal Society and Royal Academy of Engineering (2018): Greenhouse gas removal
IPCC (2022): AR6 WG3: Climate Change - 2022 Mitigation of Climate Change
Macintosh et al. (2025): Carbon credits are failing to help with climate change - here’s why. Nature. https://doi.org/10.1038/d41586-025-03313-z
Science Based Targets initiative (2025): SBTi Corporate Net-Zero Standard
The Gold Standard Foundation (2025): Principles & Requirements
Probst et al. (2024): Systematic assessment of the achieved emission reductions of carbon crediting projects. Nature Communications. https://doi.org/10.1038/s41467-024-53645-z
