Carbon Offsetting: What It Is, How It Works and the Controversies

Carbon offsetting sits at the centre of one of the most contested debates in corporate climate action. UK businesses encounter carbon offset schemes UK providers in tenders, travel bookings, and net zero planning — yet the quality of offsets varies enormously, and the line between credible neutralisation and greenwashing is often unclear.

This guide explains what is carbon offsetting, how the voluntary carbon market works, where carbon offsets explained properly support climate goals, and when they undermine them. We also address the direct question: is carbon offsetting greenwashing?

Last updated: 24 June 2026 | Reviewed by Sustainability Editor

What is carbon offsetting?

Carbon offsetting is the practice of compensating for greenhouse gas emissions by financing projects that reduce or remove an equivalent amount of CO₂e elsewhere — typically through purchasing carbon credits on the voluntary carbon market. It does not eliminate the original emissions.

Key takeaways

  • Offsetting must follow reduction, not replace it — the SBTi Corporate Net-Zero Standard limits neutralisation to residual emissions only.
  • The voluntary carbon market is distinct from the UK Emissions Trading Scheme (UK ETS) compliance market.
  • Offset quality depends on additionality, permanence, verification, and avoidance of double counting.
  • Is carbon offsetting greenwashing? — it depends on whether reductions are prioritised and credits are high-integrity.
  • Understand the mechanics of carbon credits explained before purchasing.
  • UK claims must comply with the CMA Green Claims Code.

Why UK businesses encounter carbon offsetting

Organisations turn to offsetting for several reasons:

  • Residual emissions that cannot yet be eliminated technically or economically
  • Time-bound carbon neutrality claims under PAS 2060
  • Event or product neutralisation (conferences, deliveries, specific services)
  • Customer or tender requirements for climate action evidence
  • Compliance in regulated sectors (via UK ETS, not voluntary offsets)

The commercial value is significant — but so is the scrutiny. Regulators, NGOs, and investors increasingly challenge offset-heavy strategies that lack corresponding reduction programmes.

How carbon offsetting works

The basic mechanism

  1. Measure your emissions (tCO₂e) using the GHG Protocol
  2. Reduce emissions as far as possible through operational changes
  3. Purchase carbon credits equivalent to remaining emissions
  4. Retire credits so they cannot be resold or double-counted
  5. Disclose the volume, type, and standard of credits used

One carbon credit typically represents one tonne of CO₂e reduced or removed.

Types of offset projects

Project type Mechanism Examples Permanence concern
Avoidance Prevents emissions that would otherwise occur Renewable energy, efficient cookstoves Medium — must prove additionality
Reduction Lowers existing emission sources Methane capture at landfill Medium
Removal Extracts CO₂ from atmosphere Afforestation, direct air capture, biochar High for geological storage; lower for forestry

For credible net zero neutralisation, the SBTi emphasises permanent removals over avoidance credits for residual emissions at the net zero date.

The voluntary carbon market

The voluntary carbon market (VCM) operates outside mandatory compliance schemes. Businesses purchase credits voluntarily to meet corporate climate commitments, customer expectations, or certification requirements.

How it differs from compliance markets

Feature Voluntary market UK ETS (compliance)
Participation Voluntary Mandatory for covered sectors
Purpose Corporate claims, neutrality Regulatory obligation
Price Market-driven, wide range Auction-based carbon price
Standards VCS, Gold Standard, others UK government ETS rules

Read our carbon credits guide for a full comparison of UK ETS vs voluntary markets.

The voluntary market has grown rapidly but faces ongoing integrity challenges. Initiatives such as the Integrity Council for the Voluntary Carbon Market (ICVCM) have introduced Core Carbon Principles (CCP) to raise quality standards. UK businesses should look for CCP-labelled credits where available.

Carbon offset schemes UK businesses use

International standards

Standard Focus
Verified Carbon Standard (VCS / Verra) Largest voluntary programme
Gold Standard Sustainable development co-benefits
Plan Vivo Community land use projects
Woodland Carbon Code UK forestry projects
Peatland Code UK peatland restoration

UK-specific schemes

The Woodland Carbon Code and Peatland Code provide UK-based removal credits with domestic verification — useful for organisations wanting geographic traceability.

The Carbon Trust advises organisations to prioritise reduction and treat offsetting as a supplementary tool with rigorous due diligence.

When offsetting is credible

Offsetting supports credible climate action when:

  1. Reduction comes first — offsets address residual emissions after a documented reduction plan
  2. Credits are verified — issued under recognised standards with third-party audit
  3. Additionality is demonstrated — the project would not have happened without credit revenue
  4. Credits are retired — permanently removed from the registry, not resold
  5. Claims are transparent — you state what is offset, what is reduced, and what standard applies
  6. Scope is clear — specify which emissions (scope 1, 2, 3, or specific activities) are covered

This aligns with PAS 2060 for carbon neutrality and the SBTi for net zero neutralisation.

Controversies and integrity risks

Is carbon offsetting greenwashing?

It depends. Offsetting is greenwashing when:

  • It substitutes for reduction that is technically and economically feasible
  • Credits lack additionality (the project would have proceeded anyway)
  • Forestry credits face reversal risk (fire, disease, harvesting)
  • Emissions are undercounted while offsets are marketed prominently
  • Claims imply “zero impact” without transparent disclosure

Offsetting is not greenwashing when used for genuinely residual emissions, with high-integrity credits, alongside a published reduction trajectory. Read more: is carbon offsetting greenwashing?

Are carbon credits greenwashing?

Are carbon credits greenwashing as a category? No — but low-quality credits can enable it. Evaluate each project against:

  • Additionality — would it happen without credit finance?
  • Permanence — how long is the carbon stored?
  • Leakage — do emissions shift elsewhere?
  • Double counting — are credits claimed by both buyer and host country?
  • Verification — is there independent third-party audit?

The UK government and civil society organisations have highlighted integrity concerns in parts of the voluntary market. Due diligence is essential.

Carbon offsetting in a net zero strategy

The hierarchy for credible corporate climate action:

1. Measure emissions (all material scopes)
2. Set science-based reduction targets
3. Implement reduction measures (see 15 strategies)
4. Neutralise residual emissions only (high-integrity removals)
5. Report transparently

Under the SBTi Corporate Net-Zero Standard:

  • Near-term targets must be met through absolute reductions — not offsets
  • At net zero date, up to 5–10% of emissions may be neutralised with permanent removals
  • Avoidance offsets do not qualify as net zero neutralisation

See create your net zero strategy and carbon neutral vs net zero for how offsetting fits broader commitments.

Practical guidance for UK businesses

Before purchasing offsets

Step Action
1 Complete a full emissions inventory
2 Identify and implement reduction measures
3 Define residual emissions quantitatively
4 Set a budget and quality criteria for credits
5 Select a reputable broker or buy directly from registries
6 Retire credits and retain retirement certificates
7 Disclose in annual sustainability or SECR reporting

Questions to ask providers

  • Which standard verifies the credits (VCS, Gold Standard, Woodland Carbon Code)?
  • Is the project additional, permanent, and independently audited?
  • Are credits retired on a public registry?
  • What is the project type — avoidance or removal?
  • Are CCP labels applied?

Pricing context

Voluntary carbon credit prices vary widely — from under £5/tCO₂e for some avoidance credits to £50+/tCO₂e for high-quality removals. Price alone does not indicate quality; verify against standards and project documentation.

Offsetting for specific business activities

Beyond corporate-wide neutrality, UK businesses encounter activity-level offsetting:

Events and conferences

Measure event emissions (venue energy, travel, catering, waste) and offset the calculated total. Be transparent: “We offset measured event emissions of X tCO₂e using Y standard credits” — not “carbon neutral event” without quantification.

Business travel

Some travel management companies offer per-flight offsetting. This addresses individual trips, not your entire travel footprint. Integrate travel offsets into a broader travel reduction policy — see strategy 4 in our reduction guide.

Product-level offsetting

Some businesses offer carbon-neutral delivery or products. This requires product carbon footprinting (lifecycle assessment) and offsets matched to that specific footprint. The CMA Green Claims Code applies to product claims.

Pension and investment offsetting

Some financial products market as “carbon neutral portfolios.” This is distinct from operational offsetting — evaluate through the green finance lens, not as a substitute for reducing your own scope 1–3 emissions.

The future of carbon offsetting

Several trends are reshaping the market:

  • Integrity standards — ICVCM Core Carbon Principles raising the quality bar
  • Removal focus — shift from avoidance to permanent removals for net zero neutralisation
  • UK nature-based credits — Woodland Carbon Code and Peatland Code growth
  • Regulatory scrutiny — EU Green Claims Directive and UK CMA enforcement
  • Article 6 — international carbon market rules under the Paris Agreement affecting double-counting

UK businesses should monitor these developments and review offset portfolios annually.

UK regulatory and claims context

The CMA Green Claims Code requires environmental claims to be truthful, clear, and substantiated. Offset-based claims must:

  • Specify what emissions are covered
  • Not imply zero environmental impact from business operations
  • Be supported by evidence of credit retirement
  • Not obscure the need for reduction

The EU is developing further rules on green claims that may affect UK businesses trading in Europe.

Frequently asked questions

What is carbon offsetting in simple terms?

Paying for projects that reduce or remove greenhouse gases elsewhere to compensate for emissions you still produce. It balances the carbon equation — it does not stop emissions at source.

Is carbon offsetting effective?

High-integrity offsets can finance genuine emission reductions and removals. Poor-quality offsets may not deliver real climate benefit. Effectiveness depends entirely on project quality and whether offsetting supplements — not replaces — reduction.

Is carbon offsetting greenwashing?

It can be, when used to avoid reduction or when credits lack integrity. It is not greenwashing when applied to residual emissions with verified credits and transparent disclosure. See what is greenwashing.

Are carbon credits greenwashing?

Carbon credits themselves are a market instrument. They become greenwashing when buyers use low-quality credits to make misleading claims. Evaluate credits on additionality, permanence, and verification.

Should UK SMEs buy carbon offsets?

Only after measuring emissions and implementing reduction measures. SMEs with small footprints may achieve significant cuts through renewable electricity and travel policies before needing offsets.

What is the difference between carbon offsetting and carbon credits?

Offsetting is the practice of compensating for emissions. Carbon credits are the units purchased to do so — one credit per tonne CO₂e. See carbon credits explained.

Can offsetting make a business net zero?

Not on its own. Net zero under the SBTi requires 90%+ absolute reduction with only residual emissions neutralised. Offsetting alone achieves carbon neutrality at best — see carbon neutral vs net zero.

Offset providers: due diligence checklist

Before engaging an offset provider or broker, complete this checklist:

  • Emissions inventory completed and reductions implemented
  • Residual emissions quantified (tCO₂e)
  • Credit standard specified (VCS, Gold Standard, Woodland Carbon Code, etc.)
  • Project type identified (avoidance vs removal)
  • Additionality evidence reviewed
  • Registry and retirement process confirmed
  • Retirement certificates provided post-purchase
  • Price per tCO₂e documented
  • Public claim wording reviewed against CMA Green Claims Code
  • Offsetting policy aligned with net zero strategy

Reputable providers welcome scrutiny. Providers that cannot answer these questions clearly should be avoided.

Offsetting cost benchmarking

Credit type Indicative UK price range (£/tCO₂e) Notes
Standard avoidance 3–15 Variable quality; verify project
Gold Standard avoidance 8–20 Higher sustainable development criteria
UK Woodland Carbon Code 15–30 Domestic forestry; permanence monitoring
Engineered removal (DAC) 100+ Early-stage; high permanence

Prices are indicative and change with market conditions. Cost per tonne should be secondary to quality and strategic fit within your offsetting policy.

Conclusion

Carbon offsetting is a tool — not a strategy. UK businesses that measure, reduce, and then offset residual emissions with verified credits can use the voluntary carbon market credibly. Those that skip reduction and buy cheap credits risk reputational damage and legitimate accusations of greenwashing.

Next steps:

  1. Carbon credits explained — UK ETS vs voluntary markets
  2. How to reduce your carbon footprint — reduction before offsetting
  3. Net zero guide — where offsetting fits the hierarchy
  4. What is greenwashing — protecting claim integrity

Sources

Internal offsetting policy template

Document your organisation’s position with a short internal policy:

  1. Purpose — residual emissions only, not a substitute for reduction
  2. Eligibility — which scopes and activities may be offset
  3. Quality standards — minimum verification requirements (e.g. VCS, Gold Standard, Woodland Carbon Code)
  4. Approval process — who authorises purchases and at what budget threshold
  5. Retirement and disclosure — registry requirements and annual reporting
  6. Review cycle — annual policy review as market standards evolve

An internal policy prevents ad hoc offset purchases that undermine your net zero strategy credibility.

This article is for general guidance only. It does not constitute legal, financial, or environmental consultancy advice.