Most writing on this subject is unusable. It urges you to reduce your carbon footprint, optimize your routes, and partner with green carriers, without telling you who is asking, what standard the answer has to meet, or which changes actually move the number.
Here is the practical version, built on three premises.
You probably have no legal obligation to report freight emissions. One is arriving anyway, through your customers rather than a regulator. And nearly every lever that genuinely reduces freight emissions also reduces freight spend, which means you should ignore anything that does not do both.
Who Is Actually Going to Ask You
Start here, because the timeline determines everything else.
California’s SB 253 requires US entities doing business in California with more than $1 billion in annual revenue to disclose greenhouse gas emissions. Following CARB’s adoption of initial regulations in February 2026, first reports covering Scope 1 and Scope 2 are due August 10, 2026, and CARB has proposed moving that first-year deadline to November 10. CARB has also indicated it will not impose a standardized template for the inaugural cycle and will exercise some enforcement discretion.
Scope 3 disclosure begins with reports filed in 2027. That is the date that matters to you.
Scope 3 Category 4 is upstream transportation and distribution. A covered company cannot populate it from its own records, because the emissions belong to its carriers and its suppliers. So a $1 billion customer preparing a 2027 filing needs shipment-level transportation data for activity occurring now, in 2026.
That is the mechanism. The request will not arrive as a letter from a regulator. It will arrive as a spreadsheet from your largest account, and it will ask for numbers you did not collect.
One correction worth making, because a lot of current content gets it wrong. SB 261, the climate-risk disclosure law for companies above $500 million, is presently subject to a Ninth Circuit injunction, and CARB has stated it will not enforce the statute while that injunction stands. Its original January 1, 2026 deadline is no longer operative. Do not plan around it, and be skeptical of anyone citing it as a live requirement.
If you sell into large retailers, automotive or aerospace OEMs, healthcare systems, or any customer with California or European exposure, treat 2026 as your data-collection year.
The Only Number That Matters, and the Standard Behind It
Sustainability claims in freight fail on measurement, not intent.
The unit that buyers and reporting frameworks care about is grams of CO2 equivalent per tonne-kilometre, applied shipment by shipment and rolled up. “We switched to a greener carrier” is not an answer to that question.
Two documents govern how the number gets calculated.
ISO 14083, published in 2023, is the international standard for quantifying and reporting greenhouse gas emissions from transport chain operations. It provides a harmonized method across modes, which is what makes numbers from different carriers and lanes comparable. Notably, ISO 14083 sets aside the Scope 1, 2, and 3 split as a commercially driven distinction and instead separates direct from indirect emissions.
The GLEC Framework from Smart Freight Centre supplies much of the methodological basis, and GLEC Framework v3 is aligned with ISO 14083. It is the recognized method for calculating logistics emissions for Scope 3 purposes.
You do not need to build this capability in-house. You need to know the standard exists and to ask one question of any provider making emissions claims: can you report to ISO 14083 or the GLEC Framework, and will you show the methodology?
If the answer is a marketing number with no method behind it, it will not survive a customer’s questionnaire.
EPA SmartWay Is Free, and Most Mid-Market Shippers Ignore It
This is the highest-value underused resource in the category.
The EPA SmartWay Transport Partnership has run for over two decades and includes nearly 4,000 partners. It offers no-cost, peer-reviewed sustainability accounting and tracking tools, and it has three partner categories that matter here.
- Carrier Partners submit loaded and non-loaded miles, fuel consumption by engine class, and vehicle specifications. EPA ranks them on CO2, NOx, particulate matter, and fuel efficiency.
- Shipper Partners are companies that ship goods.
- Logistics Company Partners are firms that hire carriers and manage shipments on behalf of shippers.
The useful mechanic is that carrier data is aggregated and provided back to Shipper and Logistics Company Partners, so they can assess the impact of their current transportation activity and produce performance data suitable for sustainability reporting.
EPA reports that over twenty years, SmartWay partners have prevented millions of tons of emissions and saved $55.4 billion in fuel costs. The fuel savings figure is the point. This program exists because efficiency and emissions are the same problem.
Two honest limitations. Carrier data is self-reported with some EPA validation, and the reporting cycle is annual, so the data describes past performance rather than current operations. It is a benchmarking tool, not a live telemetry feed.
What to do this quarter: ask which of the carriers in your routing guide are SmartWay partners, and make partner status a tiebreaker between otherwise comparable carriers. It costs you nothing and it gives you something defensible to put in front of a customer.
Five Levers That Cut Emissions and Cost Together
Ordered by how much they typically move the number for a mid-market shipper.
1. Mode Shift to Intermodal
On long-haul lanes, moving freight from over-the-road truckload to intermodal rail is the largest single reduction available to most shippers, and it usually reduces linehaul cost as well.
The honest tradeoff is transit time and variability. Intermodal adds days and widens the delivery window, so it works on lanes where your customer has schedule slack and fails on lanes where they do not. It also requires drayage at both ends, which is a separate coordination problem and part of the cost.
Screen your lanes by length of haul and delivery flexibility. If you have long lanes with soft delivery windows and you are still running them as pure full truckload, that is the first place to look.
2. Cube Utilization, Which You Were Already Forced to Measure
This lever is easy to miss because it arrived disguised as a pricing change.
On July 19, 2025, the National Motor Freight Traffic Association moved thousands of commodities from commodity-based to density-based classification under Docket 2025-1, with a follow-up docket effective December 6, 2025. If you tender LTL freight, you now need accurate handling-unit dimensions and weight on every shipment simply to be classified correctly.
That is the same dataset that tells you how much air you are shipping.
A trailer moving at 60 percent cube costs the same to run as one at 90 percent, and emits the same. Density improvements come from packaging redesign, pallet height standardization, mixed-SKU pallet building, and eliminating oversized cartons. Each one reduces the number of trucks required for the same volume of product.
Run your top SKUs through our density calculator and you get two answers from one exercise: whether your freight classes are right, and how much empty space you are paying to move.
3. Consolidation and Order Cadence
Several LTL shipments to the same region in the same week is usually a multi-stop truckload waiting to happen. Partial truckload sits between the two and is frequently overlooked.
The cadence question is often bigger than the routing question. A supplier shipping to you three times a week because that is how the purchase orders were written is a scheduling decision, not a logistics constraint. Moving to weekly consolidated receipts cuts trucks, cost, and receiving labor at once.
The emissions math and the freight-spend math here are the same math.
4. Carrier Selection
This is the lever a logistics provider actually controls on your behalf.
Fleet age, engine class, aerodynamic and idle-reduction equipment, and empty-mile rate all affect emissions per load. So does whether the carrier has a backhaul on your lane. A carrier running loaded in both directions produces meaningfully lower emissions per shipment than one deadheading home.
You will not audit this yourself. You can require that whoever books your freight can report on it.
5. Eliminate the Expedites You Caused
Every emergency expedite is a planning failure with an emissions receipt attached, and it is the most expensive freight you buy.
Track two numbers for a quarter: how many expedited shipments you moved, and the root cause of each. Late purchase orders, forecasting misses, and inventory positioning will account for most of them. Fixing the upstream cause removes both the cost and the emissions, and it is the cheapest reduction on this list because you are not buying anything.
What to Be Skeptical About
Four things in this category that will not hold up.
Carbon offsets as a substitute for reduction. Offset quality has been widely criticized, and marketing a shipment as carbon neutral on the strength of purchased offsets is increasingly a reputational exposure rather than a credential. Reduce first. If you buy offsets, account for them separately and do not describe the result as neutrality.
Alternative fuel and electric truck claims. These are real and they are advancing. They are also not your lever in 2026, because you do not own the fleet. Treat them as a carrier selection input, not a program you can implement.
Any emissions figure without a stated methodology. If a provider hands you a per-shipment CO2 number, ask which standard it was calculated under and what data fed it. A number you cannot defend is worse than no number, because it fails audibly in front of a customer.
Percentage reductions with no baseline. A claimed 30 percent improvement means nothing without the base year, the measurement method, and whether it is absolute or intensity-based. Ask all three.
A 90-Day Starting Plan
Sequenced so each step produces something usable.
Weeks 1 and 2. Assemble the data. Pull twelve months of shipment history. For each shipment you want origin, destination, mode, carrier, weight, and handling-unit dimensions. If dimensions are missing, that gap is your first finding, and it is the same gap that is causing freight class errors.
Weeks 3 and 4. Find where the footprint lives. Rank lanes by tonne-kilometres, not by shipment count or by spend. Most shippers discover that a handful of long lanes carry the majority of the emissions, and those are the only lanes worth optimizing first.
Weeks 5 and 6. Check the supply side. Identify which of your carriers are SmartWay partners. Ask your logistics provider whether they can report to ISO 14083 or GLEC, and ask to see a sample report rather than a description of one.
Weeks 7 and 8. Re-rate your top 20 SKUs. Density against the current NMFC scale. This fixes classification accuracy and quantifies your cube problem simultaneously.
Weeks 9 through 12. Pilot two changes. One mode-shift candidate lane and one consolidation opportunity. Measure both against the baseline you built in weeks 1 through 4. Two documented pilots is a far better answer to a customer questionnaire than a policy statement.
Frequently Asked Questions
Does Sustainable Freight Shipping Cost More?
The levers in this article generally cost less, because they reduce the number of trucks required to move the same product. What costs more is buying premium fuel programs or offsets, and those are optional. If a proposal frames sustainability as a surcharge, ask what operational change it funds.
A Customer Sent Us an Emissions Questionnaire and We Have Nothing. Now What?
Answer honestly, state your method and its limits, and show what you are building. Buyers evaluating supplier maturity generally prefer a partial answer with a stated methodology over a confident number with none. What damages you is a fabricated figure that falls apart under a follow-up question.
Should We Become a SmartWay Shipper Partner Ourselves?
If freight is a material part of your cost structure and customers are asking, yes. The tools are no-cost and the partnership gives you documentation you can share. If your volumes are small, start by requiring SmartWay status information from your carriers and revisit direct partnership later.
Do We Need a Consultant for This?
Usually not at the start. Weeks 1 through 8 of the plan above are internal data work plus questions to your logistics provider. Consider outside help when you get to formal reporting under a specific framework, or when a customer contract requires third-party assurance.
Start With Your Own Shipment Data
Nothing in this article requires a program, a policy, or a budget line. It requires twelve months of shipment records with dimensions on them, and someone willing to rank lanes by tonne-kilometres rather than by invoice total.
ATS Logistics has arranged freight since 1980 across LTL, full truckload, drayage, expedited, and international moves. If you are facing a customer emissions request, or you suspect you are paying to move air, the useful first step is a look at your actual lane and density data.
Request a freight review, or call us today.