The GLEC Framework is the logistics sector’s practical rulebook for calculating freight emissions in a way customers, auditors, and disclosure frameworks can recognise. For UK shippers, forwarders, and carriers, the 2026 issue is not whether carbon reporting is coming. It is whether your transport data is strong enough to produce numbers that survive scrutiny.
Smart Freight Centre published GLEC Framework v3.2 on 23 October 2025, according to its own framework materials and industry analysis from Searoutes. That version is now the current reference for companies preparing 2026 logistics emissions inventories. It matters because it translates ISO 14083:2023 into operating practice across road, rail, sea, air, inland waterway, and logistics hubs.
GLEC does not replace CSRD, CDP, SBTi, IFRS S2, or customer sustainability questionnaires. It sits underneath them. It gives you the activity-based freight emissions figure those reporting routes need, especially for Scope 3 Category 4 upstream transportation and Category 9 downstream transportation.
Key Takeaways
- GLEC Framework v3.2, published in October 2025, is the current industry guideline for applying ISO 14083 to logistics emissions.
- The 2026 priority is better activity data, especially distance, load factor, fuel type, empty running, and hub activity.
- The framework covers road, rail, sea, air, inland waterway, and multimodal hubs on a well-to-wheel basis.
- New v3.2 content adds an air pollutant emissions module and updated regional fuel factors.
- UK freight teams should move away from spend-based estimates for material lanes and build carrier data routines.
- GLEC is a calculation methodology, not a disclosure framework in its own right.
What the GLEC Framework Covers
The Global Logistics Emissions Council Framework was developed by Smart Freight Centre, a global non-profit founded in 2013. The first GLEC Framework was published in 2016 after work with more than 50 founding logistics companies, according to Smart Freight Centre and Searoutes. Its purpose is simple: give logistics emissions accounting a common method across modes and regions.
GLEC covers five transport modes: road, rail, sea, air, and inland waterway. It also covers logistics hubs, including terminals, warehouses, loading, unloading, and dwell activity. That hub treatment is one of the framework’s most useful differences from older freight calculators, which often stopped once they had a line-haul distance and a generic emissions factor.
The core output is an emissions intensity, usually expressed in kg CO2e per tonne-km on a well-to-wheel basis. Well-to-wheel matters because it includes both direct fuel combustion and upstream fuel or energy production. An electric truck may have no tailpipe emissions, but the electricity generation factor still needs to be counted unless a recognised market-based method applies.
For UK logistics teams already dealing with UK CBAM preparation or customer ESG questionnaires, GLEC gives freight movements the same discipline that customs teams expect from commodity, origin, and valuation records. The calculation is only as reliable as the inputs. A polished dashboard cannot rescue weak lane data.
What Changed in GLEC v3.2
GLEC Framework v3.2 is the version to plan around for 2026 inventories. Searoutes reports that the new default values were encouraged but not mandatory for 2025 inventories, and are expected and recommended for 2026 inventories. That gives operators a clear transition window: use 2026 to update tools, carrier requests, and lane assumptions before reporting pressure tightens further.
The largest addition is Module 6 for air pollutant emissions. The module covers CO2, methane, nitrous oxide, PM10, PM2.5, sulphur dioxide, nitrogen oxides, carbon monoxide, non-methane volatile organic compounds, ammonia, black carbon, and heavy metals, according to Searoutes’ v3.2 analysis. That widens the conversation beyond greenhouse gases into pollutants with local air quality impacts.
Fuel factors have also moved on. The v3.2 update refreshed values for Europe, North America, China, and India, with specific changes across LNG, CNG, electricity, ethanol, biodiesel, and HVO. Searoutes notes that India receives dedicated emission factors for the first time, while marine factors have been updated using International Maritime Organization MEPC81 material.
The practical implication is that old emissions factors may now be materially wrong. A spreadsheet built in 2023 may still look tidy, but if it uses stale electricity, marine, or alternative-fuel values, it can distort lane comparisons. Operators should check the factor source, version, geography, fuel, and effective year before trusting a number.
How GLEC Connects to ISO 14083
ISO 14083:2023 is the international standard for quantifying and reporting greenhouse gas emissions from transport chain operations. Smart Freight Centre states that ISO 14083 was built directly on the technical basis of GLEC v3, with SFC Technical Director Alan Lewis leading the ISO development project. In plain terms, GLEC became the sector’s practical bridge into the ISO standard.
That relationship is important for procurement teams. A shipper may ask a forwarder for “ISO 14083-aligned” freight emissions. The forwarder may answer using a GLEC-conformant tool or method. Those are not competing labels; they are connected layers of the same reporting stack.
GLEC is especially useful for multimodal movements. A consignment might move from a Midlands distribution centre by road, through a port terminal, across an ocean leg, through a destination hub, and onward by rail or truck. Without a common method, each party can calculate a different number and still claim to be reasonable.
If your business already compares air freight and sea freight on cost and lead time, GLEC adds a consistent emissions lens. That does not mean emissions always dictate the answer. It means the carbon figure can be put beside price, service risk, customer requirement, and inventory impact without relying on guesswork.
The Data Quality Ladder
The framework’s data hierarchy is where many UK freight teams will feel the real work. GreenCalculus describes a four-tier approach: Tier 1 is primary measured data, Tier 2 is carrier-reported activity data, Tier 3 is modelled defaults, and Tier 4 is spend-based proxy data. The direction of travel is away from Tier 4 for material lanes.
Tier 1 is strongest because it uses actual measured data such as fuel consumption or energy use tied to the movement. It is not always available, especially where subcontractors, vessel sharing, or parcel networks sit between the shipper and the asset. Where it is available, it should be treated as high-value operational data, not just sustainability paperwork.
Tier 2 is the realistic target for many 2026 programmes. It uses carrier-reported activity data such as tonne-km, vehicle type, fuel type, distance, load factor, and routing. GreenCalculus notes that CSRD 2026 expectations push material lanes towards Tier 2, which means procurement and transport teams need to specify emissions data requirements in carrier onboarding.
Tier 3 modelled defaults are useful when the movement is real but the data is incomplete. They should be transparent and version-controlled. Tier 4 spend-based proxies are the weakest option because freight cost is affected by capacity, seasonality, surcharges, contracts, and service levels, not just physical transport work.
Boundaries: Transport, Hubs, and Empty Running
Two boundary questions cause many freight emissions numbers to drift: what activity is included, and how shared activity is allocated. GLEC deals with this by defining transport chain elements and transport activity operations, then applying consistent allocation logic. For operators, the phrase matters less than the habit: write down where the calculation starts and stops.
Hub emissions deserve more attention than they usually get. GreenCalculus estimates that loading, unloading, terminal handling, and warehouse dwell can add 5-20% to a well-bounded shipment inventory. That is too large to ignore on high-volume flows, temperature-controlled freight, or networks with repeated cross-dock and fulfilment activity.
Load factor and empty running are the other large variance drivers. A full vehicle and a half-empty vehicle can produce very different emissions per tonne-km even if the route and fuel are identical. Return legs also matter because an apparently efficient outbound lane may rely on an empty movement that should be allocated somewhere in the network.
This is why freight emissions cannot be owned by the sustainability team alone. Transport planners, forwarders, warehouse teams, finance, and procurement all hold part of the evidence. If the transport management system records only shipment cost and carrier name, the reporting team will spend every year rebuilding the missing operational picture.
Why UK Operators Should Care in 2026
The strongest reason is customer pressure. Large shippers subject to CSRD, SBTi targets, CDP disclosure, or investor requests are pushing emissions requirements into freight tenders. If you move their goods, your data may become part of their Scope 3 inventory. Poor data can become a procurement weakness even before regulation touches your own entity.
GLEC aligns with the reporting frameworks customers already use. GreenCalculus notes alignment with CDP, SBTi, CSRD ESRS E1, and IFRS S2. That does not make GLEC a disclosure framework. It makes it the calculation method that produces numbers those downstream frameworks can consume.
The second reason is commercial credibility. If two carriers quote similar rates but only one can explain distance basis, fuel factors, empty running assumptions, and hub inclusion, that carrier has a stronger answer for corporate customers. The same applies to forwarders choosing between air, ocean, road, and rail options for a shipper’s board-level reduction plan.
The third reason is internal decision-making. Emissions data can expose inefficient routing, underfilled vehicles, poor consolidation, or excessive dwell. It can also support investments in cross-docking operations, rail substitution, alternative fuels, or network redesign when the financial case alone is marginal.
Practical Steps for Freight Teams
Start with your material lanes, not your entire network. Pick the routes, modes, customers, or carriers that drive most transport activity or contractual risk. For each, document the movement boundary, shipment weight, distance basis, mode, fuel or energy type, carrier, and whether hub activity is included.
Ask carriers for activity data in a standard format. At minimum, request tonne-km, distance, vehicle or vessel type where relevant, fuel type, load factor assumption, empty running treatment, and the emissions factor source used. If the carrier supplies a finished CO2e figure only, ask for the method behind it.
Keep calculation versions visible. A 2026 report should identify whether it uses GLEC v3.2 default values, carrier primary data, modelled defaults, or older assumptions. Version control prevents quiet drift when a TMS, consultant spreadsheet, or carrier portal changes factors mid-year.
Use certified or SFC-recognised partners where they fit, but do not outsource judgement. Smart Freight Centre lists certified partners that deliver emissions calculations in conformance with the GLEC Framework. Those tools can save time, especially across multimodal networks, but your team still needs to understand boundaries, data quality, and exceptions.
Finally, connect emissions reporting to existing freight governance. Add data requirements to tenders, onboarding packs, standard operating procedures, and quarterly business reviews. Treat emissions fields like service, claims, surcharge, and customs data: operationally owned, commercially relevant, and checked before year end.
What Comes Next
The next wave is better factor harmonisation. Searoutes reports that HBEFA 5.1 was published on 21 October 2025, with European road freight emission intensity values expected to update in 2026. It also points to the CLEVER harmonised emissions factor database, expected in 2026 or 2027, as part of the push for more consistent calculation inputs.
Air pollutant reporting is also likely to become more visible. GLEC v3.2’s Module 6 gives companies a method before every customer asks for the data. Operators near ports, airports, urban consolidation centres, or dense road corridors should expect local pollutant figures to become part of sustainability and planning conversations.
The main change, though, is cultural. Freight teams are moving from estimated carbon statements to auditable logistics emissions accounting. That requires named data owners, clear assumptions, evidence trails, and regular review. The businesses that start now will have fewer surprises when customers, auditors, and frameworks ask harder questions.
Frequently Asked Questions
Is GLEC mandatory for UK logistics companies?
GLEC itself is not a UK law. It is an industry methodology used to calculate logistics emissions in line with ISO 14083 and the needs of major disclosure frameworks. It becomes practically important when customers, tenders, investors, or group reporting teams require activity-based freight emissions. For many operators, the commercial requirement will arrive before any direct statutory mandate.
What is the difference between GLEC and ISO 14083?
ISO 14083 is the international standard for calculating and reporting greenhouse gas emissions from transport chain operations. GLEC is the logistics-specific framework developed by Smart Freight Centre that helps companies apply that approach in practice. Smart Freight Centre says ISO 14083 was built on the GLEC v3 technical basis. In procurement language, a GLEC-aligned calculation is often the practical route to ISO 14083-aligned freight reporting.
Which data should a forwarder collect first?
Start with shipment weight, distance, mode, carrier, fuel or energy type, vehicle or vessel category where available, and any hub activity. Then add load factor and empty running assumptions, because those two variables can materially change tonne-km emissions. For material lanes, aim for carrier-reported activity data rather than spend-based estimates. Keep a record of factor source and GLEC version for each reporting period.
Does GLEC include warehousing emissions?
GLEC includes logistics hub activity such as loading, unloading, terminal handling, and warehouse dwell where those activities sit inside the transport chain boundary. GreenCalculus estimates hub emissions can add 5-20% to a well-bounded shipment inventory. That makes hubs important for cross-dock, port, parcel, cold chain, and multi-leg distribution networks. Operators should be explicit about whether hub emissions are included or excluded.
Can a spreadsheet be GLEC-aligned?
Yes, if the spreadsheet applies the framework correctly, uses appropriate emissions factors, records boundaries, handles allocation, and documents data quality. The tool format matters less than the method and evidence trail. A specialist platform may reduce errors across complex networks, but it is not automatically better if the input data is weak. Whatever tool you use, make the assumptions reviewable.
Should small operators care about GLEC?
Small operators should care when they serve larger shippers, public-sector customers, multinational manufacturers, retailers, or forwarders with formal emissions reporting requirements. They may not need a full enterprise carbon platform on day one. They do need clean activity data, a consistent calculation method, and the ability to answer customer questions without rebuilding the evidence from scratch each time.