The carbon question on long-haul sourcing.

Why the distance intuition misleads.

A container ship moves an enormous mass a long way on relatively little fuel per tonne of cargo. That is the reason global trade in low-value goods works at all, and it is why the ocean leg is frequently a smaller share of a product's footprint than buyers assume.

What is usually larger is production. How a crop was grown, whether processing used fossil energy, how much material was wasted. For manufactured goods the inputs and the factory dominate.

And the last mile is not small. Road delivery from a port to a warehouse to a customer is inefficient per tonne-kilometre in a way sea freight is not.

None of this makes long-haul sourcing free of consequence. It means the arithmetic is not the one most people carry in their head.

The exception, and it is large.

Air freight. The difference between moving goods by sea and by air is not marginal, and for a buyer thinking about footprint it is the single decision that matters most.

That is worth knowing when a schedule slips and air freight becomes the fix, because the environmental cost of that decision is real and it is made under time pressure without anybody calculating it.

Deciding in advance which products may ever go by air, and which never will, is a policy a buyer can actually hold to.

What you can honestly say.

Very little, without a methodology and data you can defend. Regulators in several markets now test environmental claims and the burden of substantiation falls on whoever made them, which has made a lot of packaging language a liability rather than an asset.

What is defensible: specific facts. That a shipment travelled by sea rather than air. That a producer uses a named renewable input. That the deforestation due diligence was carried out and the plots geolocated. Each has a document behind it.

What is not defensible without real work: carbon neutral, low carbon, climate friendly, and any comparison with another origin. Those need a methodology, and if you have one you already know it.

Questions buyers ask.

Read next.

• Which sustainability claims you can defend

  Regulators now test environmental claims. What each common one needs behind it, and which to avoid entirely.

• When air freight is the right answer

  Expensive per kilo and occasionally the cheapest option overall. What travels by air, what cannot, and the trap for essential oils.

• Getting it on a ship

  FCL, LCL, own consolidation or reefer, and the five costs that appear after the freight quote. Written for an archipelago.

• EUDR and Indonesian goods

  What the EU Deforestation Regulation covers, the 30 December 2026 deadline, Indonesia's standard-risk classification, and why an SVLK certificate does not answer it.