Why Sustainability Matters in Freight
The logistics and transport sector accounts for approximately 8 per cent of global greenhouse gas emissions, with international shipping and air cargo among the most carbon-intensive activities in the supply chain. For Australian businesses that rely on importing and exporting goods across vast distances, the carbon footprint of freight is a significant and growing concern — not only from an environmental responsibility perspective but increasingly as a commercial and regulatory imperative.
Customers, investors, and regulators are all demanding greater transparency about supply chain emissions. Large retailers and manufacturers are setting Scope 3 emissions targets that extend to their suppliers' logistics operations. Government reporting requirements are tightening. And consumers, particularly in premium and health-conscious markets, are making purchasing decisions based on the sustainability credentials of the brands they buy from.
The question for most businesses is not whether to address freight sustainability, but how to do it practically and cost-effectively. The good news is that many of the most impactful strategies also reduce costs.
Understanding Your Freight Emissions
Before you can reduce your carbon footprint, you need to measure it. Freight emissions are determined by several factors: the mode of transport, the distance travelled, the weight and volume of goods, the fuel type used, and the efficiency of the vehicle or vessel.
As a rough guide, emissions per tonne-kilometre vary dramatically between modes:
- Air freight: Approximately 500 to 600 grams of CO2 per tonne-kilometre. This makes it by far the most carbon-intensive mode, typically 40 to 50 times higher than ocean shipping.
- Road transport: Approximately 60 to 150 grams of CO2 per tonne-kilometre, depending on vehicle type, load factor, and fuel.
- Rail: Approximately 15 to 30 grams of CO2 per tonne-kilometre. Rail is significantly more efficient than road for long-haul overland routes.
- Ocean shipping: Approximately 10 to 20 grams of CO2 per tonne-kilometre. Despite carrying goods thousands of kilometres, the sheer efficiency of large vessels makes sea freight the lowest-emission mode per unit of cargo.
These figures highlight the enormous impact that mode choice has on your freight carbon footprint. A single shipment moved by air can produce more emissions than an entire year's worth of ocean freight for the same volume.
Strategy 1: Modal Shift
The single most effective way to reduce freight emissions is to shift cargo from higher-emission modes to lower-emission ones. For Australian importers, this often means moving goods from air freight to ocean shipping wherever transit time allows.
This does not mean eliminating air freight entirely. Time-critical, high-value, and perishable goods will continue to require air transport. But many businesses default to air freight out of habit or poor planning rather than genuine necessity. By improving demand forecasting and ordering further in advance, it is often possible to move a significant proportion of air freight volumes to ocean without any impact on stock availability.
For domestic movements within Australia, consider rail as an alternative to long-haul road transport between capital cities. Rail services between Sydney, Melbourne, Brisbane, Adelaide, and Perth offer competitive transit times for non-urgent freight at a fraction of the carbon cost of road transport.
Strategy 2: Optimise Load Efficiency
Every partially filled container, truck, or pallet represents wasted capacity — and unnecessary emissions. Improving load efficiency is a straightforward way to reduce emissions without changing your transport mode or carrier.
Work with your supply chain partner to consolidate orders into full container loads whenever possible. Review your packaging to eliminate unnecessary void space. Consider whether products can be flat-packed or disassembled for shipping to improve cube utilisation. Even modest improvements in load factor — say, increasing container utilisation from 70 per cent to 85 per cent — can reduce per-unit emissions proportionally.
Strategy 3: Choose Greener Carriers
Not all carriers are equal when it comes to emissions performance. Shipping lines operating newer, more fuel-efficient vessels produce significantly fewer emissions per container than those running older tonnage. Some carriers now offer carbon-neutral or low-emission shipping options, using alternative fuels like LNG, methanol, or biofuels, or purchasing verified carbon offsets to neutralise the emissions from specific voyages.
When selecting carriers, ask about their environmental performance, fleet age, and fuel strategy. Many major shipping lines now publish sustainability reports and offer emissions calculators that allow you to compare the carbon impact of different routing and vessel options.
Strategy 4: Carbon Offsetting
For emissions that cannot be eliminated through operational changes, carbon offsetting provides a mechanism to compensate. Offsetting involves purchasing credits from verified projects that reduce or remove greenhouse gases — such as reforestation, renewable energy, or methane capture initiatives.
While offsetting should not be seen as a substitute for genuine emissions reduction, it is a legitimate tool for addressing residual emissions. When selecting offset programmes, look for certifications from recognised standards such as Gold Standard or Verified Carbon Standard (VCS) to ensure the credits represent real, measurable emissions reductions.
Several freight forwarders and carriers now offer integrated offsetting options, allowing you to neutralise the carbon footprint of individual shipments at the point of booking.
Strategy 5: Alternative Fuels and Technology
The transport industry is in the early stages of a significant fuel transition. Electric and hydrogen-powered trucks are beginning to appear in urban and short-haul applications, though widespread adoption in long-haul freight is still several years away. In ocean shipping, dual-fuel vessels capable of running on LNG, methanol, or ammonia are entering service in increasing numbers.
For Australian businesses, the practical impact of these developments varies. If you operate your own fleet or contract dedicated vehicles for local transport, investigate the availability of electric or hybrid vehicles for last-mile delivery. For international freight, preferencing carriers that are investing in alternative fuel technology supports the transition and, increasingly, will become a point of competitive differentiation.
Strategy 6: Supply Chain Redesign
Sometimes the most effective sustainability gains come from rethinking the supply chain itself rather than optimising individual transport legs. Nearshoring — sourcing from closer suppliers — reduces the distance goods need to travel. Regional distribution hubs can reduce the total kilometres goods travel by positioning inventory closer to end customers. Reverse logistics programmes that return packaging or components for reuse reduce the total volume of goods moving through the system.
These are strategic decisions that require careful analysis of cost, service level, and environmental impact trade-offs. But for businesses serious about sustainability, they can deliver transformative results.
Measuring and Reporting Progress
Whatever strategies you implement, measuring and reporting your progress is essential. Use frameworks like the Global Logistics Emissions Council (GLEC) methodology or the Greenhouse Gas Protocol to calculate and report your freight emissions consistently. Set clear reduction targets, track progress over time, and communicate your sustainability journey to stakeholders.
At CargoLine, we help our clients measure their freight emissions, identify reduction opportunities, and implement practical sustainability strategies. Whether you are just starting your sustainability journey or looking to take the next step, our team is here to help.