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For years, the central question in maritime decarbonisation was whether the shipping industry could agree on an ambitious long-term emissions target.

That question has largely been answered.

The International Maritime Organization's 2023 greenhouse gas strategy established a common ambition to reach net-zero greenhouse gas emissions from international shipping by or around 2050, alongside indicative checkpoints for 2030 and 2040 and a commitment to increase the uptake of zero and near-zero greenhouse gas fuels and technologies by 2030.

The harder question is now emerging: How does the industry turn those ambitions into commercially viable action?

That transition from policy to implementation is likely to define the next phase of maritime decarbonisation.

The industry must simultaneously address fuel availability, infrastructure, investment, regulation, technology, operational efficiency and the competitive implications of different transition pathways.

Regulation Is Moving Into a New Phase

The IMO's proposed Net-Zero Framework represents a significant development because it combines a global fuel standard with an economic mechanism intended to put a price on greenhouse gas emissions from shipping. The framework is designed to apply to oceangoing ships above 5,000 gross tonnage, which the IMO says account for more than 85% of global shipping emissions.

However, the framework is not yet a fully operational global regime.

The adoption process was interrupted when the IMO's extraordinary session in October 2025 was adjourned for one year. At MEPC 84 in April-May 2026, member states agreed to establish an intersessional working group to address outstanding concerns and seek greater convergence ahead of MEPC 85, scheduled for 30 November to 3 December 2026.

That means 2026 is becoming an important year for implementation planning.

Shipowners, fuel suppliers, ports and financial institutions must make decisions today even while some of the details of the future regulatory environment are still being developed.

The Fuel Question Remains Central

Regulation can establish the direction of travel, but it cannot manufacture fuel.

The shipping industry is evaluating a range of options, including methanol, ammonia, hydrogen-derived fuels, sustainable biofuels and other low- and near-zero-emission pathways.

Each has different requirements.

Ammonia requires substantial attention to safety, handling and supply infrastructure. Methanol benefits from growing interest and existing commercial experience but still requires significant expansion in low-emission production. Hydrogen faces challenges around energy density, storage and distribution. Biofuels can provide near-term emissions reductions but face questions concerning sustainable feedstock availability and competition for resources.

This diversity makes the transition fundamentally different from a conventional fuel switch.

The industry is unlikely to move from one dominant fuel to another overnight. Instead, multiple pathways are likely to coexist according to vessel type, trade route, fuel availability and regional infrastructure.

Infrastructure Could Become the Limiting Factor

The development of alternative fuels must be accompanied by investment across the entire supply chain.

Production facilities need to be built. Fuels must be transported and stored. Ports require bunkering infrastructure. Ships need compatible engines and fuel systems.

The IMO, together with the World Maritime University and the International Renewable Energy Agency, launched a study in 2026 examining the infrastructure requirements associated with renewable fuels for shipping. The initiative is assessing production, supply and demand, ports, fuel supply chains and infrastructure needs, with a global analysis expected in the third quarter of 2026.

The significance is considerable.

It reinforces the idea that maritime decarbonisation is not solely a shipping-sector challenge. It is increasingly an energy and infrastructure challenge.

Capital Must Move Before the Transition Is Fully De-risked

One of the most difficult aspects of the transition is the timing of investment.

Shipowners need to make decisions about vessels that could remain in operation for 20 years or more. Fuel producers need to invest in facilities before demand is fully established. Ports need to prepare for fuels whose long-term market shares remain uncertain.

This creates a classic investment dilemma.

Waiting for certainty can delay infrastructure development. Investing too early can create stranded-asset risk.

Finance therefore becomes an essential bridge between policy ambition and commercial deployment.

Green finance, transition finance, sustainability-linked lending, blended finance and public-private partnerships can all play roles in reducing the risk associated with early-stage investment.

The broader energy market is already experiencing a major increase in capital deployment. The International Energy Agency's World Energy Investment 2026 report identifies energy security as an increasingly important influence on investment priorities and provides updated data on capital flows across energy sectors and regions.

For shipping, the challenge is ensuring that sufficient capital reaches the infrastructure and technologies needed to decarbonise the sector.

Existing Ships Cannot Be Ignored

The transition will not happen simply by replacing today's fleet with cleaner ships.

A substantial existing fleet will remain operational for years. Improving the efficiency of these vessels therefore remains critical.

Operational optimisation, energy-saving technologies, improved hull and propeller performance, digital voyage management and other efficiency measures can reduce fuel consumption while alternative fuel infrastructure develops.

The IMO continues to strengthen and refine measures covering ship energy efficiency and operational carbon intensity. At MEPC 84, for example, the organisation adopted updated guidelines relating to carbon intensity indicators and ship energy efficiency management.

This highlights an important principle.

Decarbonisation must happen across both the new-build fleet and the existing fleet.

Measurement Will Become More Important

As regulatory and financial pressure increases, reliable emissions data will become increasingly valuable.

The industry needs to know not only how much fuel a vessel consumes, but also the lifecycle emissions associated with that fuel.

This is particularly important as the market moves towards fuel standards based on lifecycle greenhouse gas intensity.

The IMO has been working on fuel lifecycle assessment methodologies, while its 2026 work includes discussions around chain-of-custody models for tracking fuel origin and movement through supply chains.

Better data will influence compliance, fuel procurement, financing and potentially the commercial value of different assets.

Commercial Strategy Will Become More Important

The transition is increasingly becoming a strategic business issue.

Shipowners will need to consider:

• Which fuels will be available on their core trade routes?
• How quickly should existing vessels be upgraded?
• Which newbuild technologies offer the strongest long-term flexibility?
• How will carbon costs affect voyage economics?
• Where should alternative-fuel infrastructure be developed?
• How should transition risks be reflected in fleet financing?

These are not purely environmental questions.

They are questions about asset values, competitiveness, capital allocation and long-term commercial strategy.

Regional Differences Will Matter

The global nature of shipping creates another complication.

Fuel production will not be evenly distributed. Regulatory regimes will differ. Infrastructure investment will vary between regions.

A vessel trading between major Asian ports may face a different transition environment from one operating primarily in European waters.

This means shipping companies will increasingly need transition strategies tailored to individual trade corridors.

Green corridors could become particularly important because they allow fuel suppliers, ports, shipowners and cargo interests to coordinate investment around defined routes.

The Next Phase Is About Execution

The shipping industry's climate transition has reached a point where announcements alone are no longer sufficient.

The next phase will be judged by infrastructure built, fuels produced, vessels deployed, emissions reduced and capital mobilised.

This makes implementation capacity increasingly important.

Governments need to provide predictable policy frameworks. Energy companies need to develop supply. Ports need to invest in infrastructure. Financial institutions need mechanisms for managing transition risk. Shipowners need commercially credible fleet strategies.

Each part of the system depends on the others.

Maritime decarbonisation has entered a new stage.

The industry's long-term direction is increasingly clear, but the path towards implementation remains complex. Regulation is evolving, alternative fuels are competing for scale, infrastructure is still developing and investors are navigating considerable uncertainty.

The central challenge is therefore no longer simply setting ambitious targets.

It is building the commercial and physical systems capable of delivering them.

The outcome will depend on whether regulation, finance, fuel supply, infrastructure and fleet investment can move forward at sufficient speed and in sufficient coordination.

The next phase of maritime decarbonisation will ultimately be measured not by the ambition of its targets, but by the scale of its execution.