Can Transport Hubs Truly Detach Their NetZero Goals from the Emissions They Enable?

Transport hubs such as airports, roads, and ports are often seen as symbolic hubs of global carbon emissions. Jets roar overhead, highways stretch across landscapes, and ships unload containers at massive terminals, while the infrastructure that supports these movements promotes net zero targets and sustainability pledges.

This contradiction captures a deep tension in greenhouse gas (GHG) accounting: to what extent are these hubs responsible for the emissions of the vehicles they exist to serve? As transport infrastructure providers roll out carbon-neutral strategies, it is worth examining whether these claims can truly stand apart from the emissions-intensive activities they enable.

Operational Boundaries vs. Moral Responsibility

Under the Greenhouse Gas (GHG) Protocol, emissions are classified into three scopes:

• Scope 1: Direct emissions from sources owned or controlled by the reporting entity.
• Scope 2: Indirect emissions from purchased electricity, heat, or steam.
• Scope 3: All other indirect emissions occurring in the value chain.

In this framework:

• An airport reports emissions from heating, on-site fuel use, airport-owned vehicles, and electricity as Scope 1 and 2.
• A road authority reports emissions from maintenance vehicles, construction materials, and street lighting.
• A port operator reports emissions from on-site operations, cranes, and port-run facilities.

But emissions from aircraft, road vehicles, and cargo ships? If the infrastructure operator doesn’t own the vehicle or purchase the fuel, these fall outside all scopes. Instead, they are Scope 1 emissions for the airline, haulage company, or shipping line.

This distinction is clear and defensible from an accounting perspective. Yet, it jars with public perception. These infrastructure systems are the physical enablers of transport. Can they claim to be net zero while facilitating high-carbon movement?

Fuel Sales: The Scope 3 Trigger

The answer changes if the transport hub operator sells fuel to users:

• If an airport sells jet fuel,
• If a port sells marine fuel,
• Or if a rest stop on a road sells petrol or diesel,

Then the transport hub operator is responsible for Scope 3, Category 11: Use of Sold Products. The combustion of that fuel must be included in the infrastructure operator’s emissions tally. This creates a direct link between the business model and the emissions from transport.

If no fuel is sold or directly financed, then even massive volumes of vehicle emissions do not fall under Scope 3. They are instead “facilitated emissions” that are enabled but not owned or sold.

The Moral Disconnect

While these boundaries make sense for consistent reporting, they can appear ethically hollow. To the general public, the transport hub, be it an airport, highway, or port that claims net zero status while enabling millions of tonnes of emissions each year seems disconnected from reality.

In practice, these transport hub providers are key enablers of carbon emissions. Their design, capacity, and business incentives shape the efficiency and volume of transport activity. Critics argue they should acknowledge these enabled emissions even if not required in formal reporting. Concepts like “facilitated emissions” are gaining traction in sustainability conversations.

Reconciling Net Zero with Purpose

To credibly pursue net zero, transport hub operators must reconcile their operational boundaries with their broader purpose. Some are already moving in this direction:

• Publishing territorial emissions that include aircraft, vehicle, or vessel movements.
• Partnering with transport operators to encourage sustainable fuel adoption.
• Electrifying ground operations, enabling electric vehicles and vessels.
• Investing in carbon removals scaled to match enabled emissions.

These actions go beyond GHG accounting into true climate stewardship. They recognize that a net zero claim is not just about greening the infrastructure, but about influencing the emissions of the activities it exists to support.

Conclusion

GHG accounting standards rightly focus on control, ownership, and value chain boundaries. But climate responsibility doesn’t stop at those lines. For infrastructure operators, the moral connection to transport emissions is undeniable. To maintain public trust and climate integrity, airports, roads, and ports must not only report accurately, but act meaningfully on the emissions they enable.

NetZero, in this context, must be more than a technical achievement, it must align with their fundamental role in the world.

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