Introduction

Carbon offsetting has evolved significantly in recent years. Once viewed as a niche or optional sustainability tool, offsetting has now become an established part of the global climate strategy landscape. For forward-thinking organisations in the United Kingdom, offsetting can play a strategic role in addressing unavoidable emissions, supporting credible net zero plans, and demonstrating climate leadership to customers, investors and regulators.

However, not all offsets are equal. The increasing sophistication of ESG scrutiny, concerns about transparency, and the rapid rise of voluntary carbon markets have created both opportunities and risks. High-quality offsets can strengthen sustainability claims, enhance stakeholder trust, and complement long-term decarbonisation efforts. Poor-quality offsets can damage reputation, expose organisations to legal risk, and undermine any genuine progress.

This white paper provides a comprehensive guide for businesses that want to purchase high-quality offsets that deliver real climate benefit. It is written to support organisations at all stages of their sustainability journey, from those buying offsets for the first time to those refining their approach in line with new standards such as ISO 14068 and evolving guidance from the Science Based Targets initiative (SBTi).

NCZ has produced this guide to give businesses the clarity needed to participate responsibly in the carbon market. As an independent certification body and carbon accounting partner, we help companies understand what credible offsetting looks like, when it should be used, and how it fits into a science-aligned path to net zero.

 

1. What Carbon Offsetting Really Is

At its core, carbon offsetting refers to the purchase of carbon credits that represent a verified reduction or removal of one tonne of carbon dioxide equivalent (tCO2e). These credits are generated by climate projects around the world that avoid emissions, remove greenhouse gases, or support long-term climate resilience.

A carbon credit should represent real, measurable, additional, and permanent climate benefit. When an organisation purchases a credit that meets these criteria and retires it in a recognised registry, it can claim that the emission associated with that credit has been balanced against an equivalent portion of its footprint.

Offsetting therefore does not erase emissions at the source. Rather, it compensates for emissions that cannot currently be eliminated through internal reductions.

Why businesses offset

1. To balance residual emissions after reduction efforts
2. To meet carbon neutrality, climate positive or net zero commitments
3. To comply with industry requirements or client expectations
4. To support climate finance in developing regions
5. To accelerate decarbonisation beyond their operational boundaries

When done responsibly, offsetting helps drive climate impact while also supporting biodiversity, community development, renewable energy, and adaptation work.

 

2. The Difference Between Avoidance and Removal Offsets

The voluntary carbon market includes two major types of offsets:

Avoidance credits

These projects prevent emissions that would have otherwise occurred.

 Examples include:

• Renewable energy projects
• Cookstove programmes
• Methane capture
• Deforestation prevention and forest protection

Avoidance credits are widely available and often cost less. Their challenge is that they depend on proving what would have happened without the project, which is not always straightforward. Nonetheless, many avoidance credits remain legitimate and valuable when verified to robust standards.

Removal credits

These projects physically remove carbon dioxide from the atmosphere.

 Examples include:

• Reforestation and afforestation
• Soil carbon sequestration
• Biochar
• Direct air capture

Removal credits are increasingly preferred by scientific bodies because they align directly with long-term net zero requirements. They tend to be more expensive but are important for balancing residual emissions once a business reaches deep decarbonisation.

Which type should you buy?

The SBTi allows avoidance offsets for carbon neutrality claims but requires removals for long-term net zero balancing. ISO 14068 also emphasises removals for residual emissions. In practice, most organisations benefit from a mix, but should plan for a gradual transition toward removals.

 

3. What Makes a Carbon Credit Credible

High-quality carbon credits share several defining characteristics. When evaluating potential purchases, businesses should assess the following criteria.

Additionality

The project must demonstrate that the emission reduction or removal would not have occurred without carbon finance. If a project would have happened anyway, the credit has no climate value.

Permanence

There must be a reasonable guarantee that the emission reduction or removal will last for a defined period. Forestry projects often include buffer pools to insure against fires or deforestation.

Measurability and transparency

Emissions reductions must be quantified using recognised methodologies and recorded in a transparent registry.

Verification by independent third parties

Credible projects undergo periodic audits from accredited verifiers who check that the results are accurate and legitimate.

No double counting

A valid credit cannot be sold twice or claimed by both the project host country and the credit buyer. This is critical for compliance with Article 6 of the Paris Agreement.

Alignment with reputable standards

High-quality credits come from standards such as:

• Gold Standard
• Verra Verified Carbon Standard (VCS)
• The American Carbon Registry (ACR)
• Puro.earth (for removals)
• UK Woodland Carbon Code
• UK Peatland Code

 

4. Red Flags and Common Risks in the Offset Market

The voluntary carbon market is improving, but risks still exist. Buyers should be aware of the most common issues.

Low-cost credits with unclear documentation

One of the strongest indicators of low-quality offsets is a very low purchase price paired with vague project information.

Carbon credits that cannot be traced in a registry

Every legitimate credit is issued with a serial number and can be tracked from issuance to retirement.

Projects that cannot demonstrate additionality

If a project is financially viable without carbon finance, its emissions reductions may not be additional.

Double counting

If the host government is claiming the same reductions toward its national targets, credits may be invalid.

Over-reliance on avoided emissions

Avoidance projects can be robust, but many rely on uncertain baselines.

Greenwashing claims

Poor-quality offsets have been linked to reputational damage, particularly when used to justify bold marketing claims.

 

5. How Offsetting Fits Into a Credible Net Zero Strategy

Offsetting has an important role but must be used in the right order.

The correct sequence is:

1. Measure emissions accurately across Scopes 1, 2 and 3
2. Reduce emissions wherever possible via operational change, energy optimisation, and supply chain engagement
3. Offset only the residual emissions that cannot be eliminated in the near term

Offsetting without meaningful reduction is widely recognised as greenwashing.

ISO 14068 requires:

• Deep and genuine reduction of operational emissions
• Clear separation between reductions and offsets
• A plan to transition towards removal credits for residual emissions

SBTi requires:

• At least 90% reduction of emissions by 2050
• Use of removal offsets only for residual emissions
• No use of offsets to meet near-term reduction targets

 

6. How Many Offsets Should a Business Buy?

The number of offsets required depends on the scope of emissions a business chooses to balance.

Options include:

• Scope 1 and 2 neutrality

 Suitable for early-stage climate commitments.

• Scope 1, 2 and 3 neutrality

 Increasingly preferred by customers and regulators.

• Product-level neutrality

 Often used by FMCG, manufacturing and consumer goods companies.

• Event or project-specific neutrality

 Used for one-off campaigns or supply chain partnerships.

 

7. How to Select the Right Carbon Offsetting Projects

Different businesses have different sustainability priorities. Project selection can align with organisational values and wider ESG commitments.

Project categories include:

Nature-based solutions

• Reforestation
• Blue carbon
• Peatland restoration

Nature-based offsets support biodiversity and community development but must be assessed for permanence.

Renewable energy

• Solar
• Wind
• Hydro

Renewables support grid decarbonisation but may face additionality challenges in mature markets.

Household and community projects

• Clean cookstoves
• Water filtration
• Biogas

These projects deliver strong social co-benefits.

Engineered removals

• Biochar
• Carbon capture and storage
• Direct air capture

These projects offer high permanence and high verification confidence, but at a premium price.

8. How to Evaluate the Cost of Carbon Offsets

Offset pricing varies based on project type, location, verification standard, vintage year, and co-benefits. As a general rule:

• Avoidance credits often range from £5 to £25 per tonne
• Nature-based removals often range from £15 to £60 per tonne
• Engineered removals often exceed £150 per tonne

Low prices often hide high risk, however, high prices do not always guarantee quality. They usually reflect higher validation and more advanced technologies.

 

9. Claims Businesses Can Make When Using Offsets

Organisations must make careful and accurate claims to avoid greenwashing.

Permitted claims include:

• Carbon neutral for the stated scope, when residual emissions are offset
• Climate compensated
• Net zero for specific products or events (if evidence supports it)
• Carbon balanced

Claims that require caution:

• Carbon negative or climate positive
• Zero emissions operations
• Fully sustainable or environmentally friendly

Claims that are not permitted:

• Net zero when reductions have not been achieved
• Carbon neutral using avoidance offsets when regulations require removals
• Offsetting used to mask ongoing high emissions

 

10. How NCZ Supports Clients With Offsetting

NCZ acts as a trusted partner for organisations seeking credible climate action. Our support covers the full lifecycle of carbon management.

Our services include:

• Accurate measurement of Scopes 1, 2 and 3
• Detailed carbon reporting aligned with GHG Protocol and ISO 14064
• Access to high-quality carbon credits verified to leading global standards
• Support with offset retirement and registry documentation
• Certification through our Blue, Silver, Gold and Platinum tiers
• Compliance guidance for UK and international standards

NCZ ensures that offsetting becomes a strategic advantage, not a reputational risk.

 

Conclusion

Carbon offsetting can be a powerful tool for businesses that want to take responsibility for their environmental impact. However, it must be approached with caution, transparency, and alignment with recognised standards. High-quality offsets support credible climate action. Low-quality offsets create significant reputational risk.

By understanding the different types of offsets, verifying project quality, purchasing from trusted standards, and using offsets only after genuine emissions reductions, businesses can participate in the voluntary carbon market with confidence.

NCZ supports organisations at every step of this journey, ensuring that offsetting becomes part of a responsible, science-aligned, and commercially valuable net zero strategy.

If you are ready to explore verified, high-integrity carbon offsetting for your organisation, contact  Jacob at jacob@nczgroup.com.