For most companies, flights and rental cars sit near the top of their Scope 3 emissions inventory — visible, measurable, and increasingly scrutinised by clients, investors, and regulators. Under the GHG Protocol, business travel falls under Scope 3 Category 6. Under CSRD, it is a mandatory disclosure item. The question is no longer whether to act on it. The question is how — and in what order.

This guide covers the full picture: how to measure your travel footprint, how to reduce it as far as practically possible, and how to offset what remains with carbon credits that genuinely deliver. We put the emphasis where it belongs — on the offset step, where most companies either get it right or get it badly wrong.

Direct answer: To offset business travel emissions, companies first calculate their travel footprint using a recognised tool, reduce what they can through a clear travel policy, and then purchase high-quality voluntary carbon credits to compensate for the emissions that remain. Credits should be certified under Gold Standard or Verra (VCS), independently verified for additionality, permanence, and real climate impact, and aligned with CSRD reporting requirements.

Why Business Travel Emissions Deserve Your Full Attention

Business travel is one of the few Scope 3 categories where companies exercise direct control. Unlike supply chain emissions, you set the travel policy. Unlike product use-phase emissions, the data is already sitting in your finance or travel management system. There is no excuse for not knowing your numbers — and increasingly, no room to ignore them.

Flights dominate the picture. A single long-haul return flight in economy class produces roughly 1.5 tonnes of CO₂ equivalent per passenger. Business class carries approximately three to four times that figure, due to the larger cabin footprint each seat occupies. Rental cars and lease vehicles add up too, particularly for field sales teams, account managers, and any organisation with geographically distributed operations.

For companies reporting under CSRD, Scope 3 Category 6 is not optional. It must be measured, disclosed, and accompanied by a credible reduction and compensation strategy. Stakeholders — auditors, ESG rating agencies, procurement teams at larger clients — will compare your numbers year over year and ask pointed questions if the trajectory is not improving.

Beyond compliance, business travel is one of the most culturally sensitive emissions categories inside an organisation. How a company handles its travel policy sends a clear signal to employees about whether sustainability commitments are real or performative. Getting this right matters internally as much as it does externally.

Step 1 — Measure Your Business Travel Emissions

You cannot manage what you do not measure. The starting point is a complete picture of your travel footprint across all relevant transport modes.

For flights, the ICAO Carbon Emissions Calculator (icec.icao.int) is the standard reference tool, accepted by the GHG Protocol and most major reporting frameworks. It calculates emissions per passenger per route, accounting for aircraft type, cabin class, and a radiative forcing factor that reflects the additional warming effect of aviation at altitude beyond CO₂ alone.

For rental cars and lease vehicles, use the GHG Protocol emission factors for the relevant fuel type — petrol, diesel, hybrid, or electric — applied to total kilometres driven. Most corporate travel management systems or expense platforms can export this data directly.

The output you are looking for is a single figure: total business travel emissions in tonnes of CO₂ equivalent per year, broken down by transport mode. This number is your baseline. It feeds your reduction targets, your offset volume calculation, and your CSRD disclosure.

Step 2 — Reduce to an Absolute Minimum

Offsetting is not a licence to fly. Before any credit purchase is justified, a company needs to demonstrate that it has taken its reduction obligation seriously. The word "minimum" matters here — not "somewhat less than before," but genuinely as low as operationally possible.

Virtual first — without exceptions. Any meeting that can happen over video should happen over video. This is not a guideline to apply when convenient; it should be a default that requires active, documented justification to override. Many organisations that adopted this discipline during the pandemic quietly abandoned it afterwards. The emissions impact of reverting to in-person defaults is significant and entirely avoidable.

Train over plane for short-haul routes. For journeys under three hours by rail, the train should be the automatic choice — no discussion required. A Eurostar or Thalys journey emits roughly 15 times less CO₂ per passenger than the equivalent flight when you factor in door-to-door travel. For intra-European travel generally, the rail network covers the majority of business destinations with journey times that are genuinely competitive once airport check-in and transit time is factored in.

Economy class as the policy standard. Business class seats occupy significantly more cabin space per passenger, which translates directly into a higher per-passenger share of total flight emissions. On a long-haul route, a business class seat can carry three to four times the carbon footprint of economy. The comfort differential is real, but so is the emissions differential. Unless there is a specific operational reason — overnight travel for a key executive, medical requirements — economy should be the default in your travel policy, not a preference.

Consolidate trips wherever possible. Two short trips to the same region in the same month should, where scheduling allows, become one slightly longer trip. This reduces the number of take-off and landing cycles, which are among the most emissions-intensive phases of any flight.

One of the most effective structural tools for driving genuine and lasting behaviour change is an internal carbon price — a notional cost per tonne of CO₂ applied to all business travel at the point of booking. When a long-haul flight carries a visible carbon surcharge that sits in a team's budget, decision-makers weigh alternatives differently. Companies using internal carbon pricing are significantly more likely to reduce their emissions year over year than those relying on policy guidance alone.

Step 3 — Offset What Remains with High-Quality Carbon Credits

Once you have reduced your travel emissions as far as practically possible, carbon credits allow you to take responsibility for the remainder. One carbon credit represents one tonne of CO₂ equivalent that has been avoided or removed from the atmosphere through a verified project — certified under an internationally recognised standard and independently audited by a third party.

Purchasing carbon credits does not erase the emissions from your Scope 3 inventory. Under CSRD, gross emissions must be disclosed separately from offset volumes. What credits do is allow you to make a credible, verifiable claim that the climate impact of your residual travel has been compensated — provided the credits you buy are genuinely high-quality.

That last condition is where most companies get into trouble.

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Which Carbon Credits Should You Choose?

Research published in Nature Communications found that 84% of carbon credits on the market do not represent real climate impact. The projects behind them overstate their baselines, fail to account for leakage, or lack the permanence to sustain their claimed reductions over time. Buying the wrong credits is not a neutral act — it creates legal and reputational exposure under the Green Claims Directive and CSRD, and it does nothing for the climate.

Regreener's Quality Framework was built to navigate exactly this problem. Every project in our portfolio is evaluated across five domains before it reaches a client:

1. General Project Details We verify registry, methodology, project location, and core documentation. Any red flag at this stage — an unrecognised methodology, missing verification reports, inconsistencies in the project design document — ends the process immediately. Only credible, legitimate projects enter the pipeline.

2. Carbon Impact This is the most critical domain. We verify additionality: would the emission reduction or removal have happened without the carbon finance? We analyse historical data and satellite imagery to validate the claimed baseline. We test for leakage — the risk that emissions simply shift to an adjacent area rather than being genuinely avoided. And we assess permanence: can this project withstand wildfire, political instability, or land-use change over the duration of the credit vintage? For forest and land-based projects in particular, permanence is non-negotiable.

3. Co-Benefits Real climate solutions deliver more than a carbon number. We assess each project's impact on biodiversity, water quality, soil health, and local livelihoods. Projects that support multiple UN Sustainable Development Goals score higher — both because they deliver broader impact and because they are more resilient to reputational scrutiny.

4. Reporting Process We look for transparent, continuous, third-party verifiable monitoring, reporting, and verification (MRV). Projects using digital MRV tools — satellite monitoring, IoT sensors, independent data audits — provide a level of confidence that paper-based, periodic reporting simply cannot match. One-time claims are a red flag; consistent, updatable evidence of impact is what we require.

5. Compliance & Reputation Even technically sound projects can damage your brand if linked to controversy. We screen every project against the ICVCM's Core Carbon Principles, check CSRD alignment, and scan public records and media for any red flags — litigation, community conflicts, adverse NGO reporting. Protecting your reputation is as important as protecting the climate impact of your purchase.

For business travel offsetting specifically, we recommend a portfolio that includes a meaningful share of carbon removal projects — biochar, soil carbon, peatland restoration, or enhanced rock weathering — rather than relying exclusively on avoidance credits. Removal is permanent by definition; it aligns with the direction of travel in reporting frameworks and with the Oxford Principles for Net Zero Aligned Offsetting, which explicitly call for a shift towards higher-quality removal over time.

In terms of pricing: expect to pay in the range of €12–€40 per tonne for high-quality voluntary carbon credits. Anything significantly below that range should prompt careful scrutiny of the methodology and verification process behind the project. The reputational cost of a greenwashing claim will always exceed the savings from buying cheap credits.

Taking the Next Step on Business Travel Emissions

Measuring, reducing, and offsetting business travel emissions is one of the most actionable parts of any corporate climate strategy. The data is accessible, the levers are clear, and the frameworks — GHG Protocol, CSRD, the Oxford Principles — tell you exactly what good looks like.

The hard part is not knowing what to do. It is doing it with credits that actually hold up — to auditors, to clients, and to your own standards.

At Regreener, we help companies across Europe build offset portfolios that are credible, CSRD-aligned, and built on projects that deliver real impact. Whether you are offsetting your first tonne or overhauling an existing programme, we start with the numbers and work from there.