Supply chain decarbonization is usually framed as a shipping-industry problem: bigger ships, cleaner fuel, greener ports. A new study from EY-Parthenon, the strategy and transactions arm of EY Greece, makes a different point. Decarbonizing ocean shipping is not primarily a fuel or fleet-modernization question. It is a broader industrial, technological, financial, and regulatory challenge that touches the entire maritime value chain, and that value chain runs directly through every e-commerce brand that ships product across a border.

For an e-commerce operator, that framing matters more than it looks at first glance. When ocean carriers face a comprehensive, multi-year transformation rather than a simple fuel swap, the cost, complexity, and compliance burden of that transformation does not stay contained to the shipping lines. It moves down the chain to freight forwarders, to 3PLs, and eventually to the brands paying for cross-border capacity.

That is the real reason a maritime strategy report belongs on an e-commerce operator's reading list. Supply chain decarbonization is becoming a cost line, a reporting obligation, and a carrier-selection criterion all at once, and brands that treat it as someone else's problem are going to be caught up in it anyway.

What the EY-Parthenon Study Actually Argues

The study's central claim is that shipping decarbonization has been treated too narrowly. Alternative fuels and newer, more efficient vessels get most of the public attention, but according to EY-Parthenon, that is only one layer of what the industry needs to actually hit its climate targets. The transformation also requires new financing structures for expensive fleet and fuel transitions, new port and bunkering infrastructure, and a regulatory environment that keeps pace with all of it.

In other words, this is not a story about ships getting a new coat of green paint. It is a story about an entire industrial system, ships, ports, fuel producers, financiers, and regulators, needing to move together for decarbonization to actually work at scale. A roadmap that only addresses fuel choice while ignoring financing or infrastructure is, in the study's framing, not a realistic roadmap at all.

Why This Cascades Down to E-commerce Supply Chains

Ocean carriers do not absorb the cost of a multi-year fleet and fuel transition quietly. Compliance costs tied to international shipping emissions rules have already shown up as surcharges on freight invoices in recent years, layered on top of standard fuel and peak season charges. As the transition described in the EY-Parthenon study deepens, that pattern is likely to continue, not reverse.

For an e-commerce brand sourcing product from outside Europe, whether from Asian manufacturing hubs or elsewhere, ocean freight is often the first and largest leg of the journey to a European warehouse. A structural shift in how that leg is priced and regulated eventually reaches the landed cost of every unit sold, whether or not the brand ever thinks about vessel fuel directly.

Emissions Reporting Is Becoming a Buyer Requirement, Not Just a Regulator One

Separately from freight cost, European reporting frameworks are already pushing more companies to disclose emissions across their full value chain, including the emissions embedded in transport and logistics. That reporting burden increasingly reaches mid-size e-commerce brands, not only the largest multinational retailers, and ocean freight is typically one of the largest single emissions line items a merchant has to account for.

It is also spreading through commercial relationships that have nothing to do with regulation directly. Large retail platforms and B2B buyers are starting to ask their suppliers for shipment-level emissions figures as part of routine vendor onboarding, well ahead of any legal requirement to do so. A brand that cannot answer that question when a major buyer asks risks losing the account to one that can, regardless of what any regulator eventually mandates.

The Business Impact: Cost, Reporting, and Carrier Selection

Three practical effects follow from all of this. First, freight cost volatility tied to decarbonization compliance is likely to persist as a recurring line item rather than a temporary surcharge that eventually disappears. Second, emissions data that used to live only in a carrier's sustainability report is increasingly something a brand needs for its own reporting, which means carrier selection now has a data-availability dimension alongside price and transit time.

Third, and least discussed, not every carrier is progressing at the same pace on this transition. Some are investing seriously in alternative fuel vessels and transparent emissions reporting. Others are moving more slowly. That gap is going to widen, which means the carriers best positioned to help a brand manage both cost and reporting exposure will not necessarily be the cheapest ones on a rate card today.

Financing Is the Bottleneck Most Roadmaps Skip Over

The EY-Parthenon study puts real weight on financing as a constraint, and it is worth taking seriously rather than treating as background detail. Retrofitting or replacing vessels, building new fuel bunkering infrastructure, and running two fuel systems in parallel during a transition all require capital most shipping lines cannot simply absorb out of current earnings. Carriers that solve their financing problem well are likely to move faster and pass through more predictable costs. Carriers that do not are more likely to lag, then catch up in sudden, disruptive jumps in surcharge pricing once compliance deadlines force the issue.

For a shipper, that financing gap is not an abstract industry concern. It is a reasonably good predictor of which carrier relationships will feel stable over the next several years and which ones are more likely to produce cost surprises.

What E-commerce Operators Should Do Now

None of this requires an e-commerce brand to become a shipping policy expert. It does require treating carrier selection, across ocean freight and the parcel network that follows it, as a decision that includes emissions data and transition credibility, not just cost and speed.

• Ask ocean freight partners and forwarders directly what emissions data they can provide per shipment, not just per year
• Track decarbonization-linked surcharges as their own cost category, separate from general fuel and peak season fees
• Factor carrier sustainability progress into vendor selection alongside price and transit reliability
• Build emissions data collection into freight and last-mile carrier relationships before a reporting deadline forces it
• Keep carrier options flexible so a brand can shift volume toward carriers making credible progress without a full operational overhaul

Sustainability Is Moving From Marketing to Infrastructure

For years, sustainability in e-commerce logistics was largely a marketing conversation: recyclable packaging, a carbon-neutral shipping badge at checkout. The EY-Parthenon study is a reminder that the real transformation is happening one level below that, in fuel, fleet, financing, and regulation, and it is far less optional than a checkout badge ever was.

Brands that treat decarbonization purely as a communications exercise are going to be surprised by the cost and reporting side of it. Brands that treat it as an infrastructure and carrier-selection question, the same way they already treat cost and speed, are the ones positioned to manage it without disruption to delivery promises or margin.

This is also where the European context adds a real advantage. Benelux and French e-commerce merchants already operate in a market where sustainability expectations from customers and regulators run ahead of most of the world, which means the emissions-reporting muscle a brand builds now for ocean freight applies directly to the last-mile carrier decisions it is already used to making, from choosing electric delivery vans and cargo bikes in city centers to picking carriers that publish real route-level emissions data rather than a single annual estimate.

Common questions

Does shipping decarbonization affect small and mid-size e-commerce brands, or only large retailers?

It affects both, though the pathways differ. Large retailers face direct reporting obligations sooner, while smaller brands are more likely to feel it first through freight surcharges and through customers or B2B buyers asking for emissions data further down the supply chain.

Will greener ocean freight simply cost more, permanently?

Some cost increase during the transition period is likely, since new fuels and vessels require real investment. Whether that becomes a permanent premium or narrows over time depends on how quickly infrastructure and financing catch up, which is precisely the gap the EY-Parthenon study is focused on.

What should an e-commerce brand ask a carrier about decarbonization?

Ask for concrete emissions data at the shipment level, ask about their fleet and fuel transition timeline, and ask how any related surcharges are calculated and expected to change, rather than accepting a general sustainability statement at face value.

Ocean shipping's decarbonization roadmap is a maritime industry story on the surface, but its cost, its data requirements, and its carrier-selection implications all land squarely on e-commerce operators shipping across borders. Managing that well means being able to compare carriers on emissions progress the same way an operator already compares them on price and speed, and shifting volume when a better option emerges. That is exactly the flexibility Zineps, a Logistics OS for e-commerce, is built to provide: multi-carrier routing that lets merchants weigh cost, speed, and sustainability together, instead of locking into one carrier's pace of change.