The Pathway Matters in Maritime Decarbonization

Tuesday, 15 September, 2026
Reading Time : 3:30 minutes

As the maritime sector evaluates methanol and other alternative fuels, a new life cycle assessment reveals why production pathways can be as important as the fuel itself.

Not all methanol is created equal. A new life cycle assessment commissioned by SGMF, a non-governmental, membership-based organisation, found that greenhouse gas emissions can vary significantly across methanol production pathways, offering important insights for maritime stakeholders evaluating future fuel strategies.

Understanding what drives a fuel’s environmental performance is becoming increasingly important for shipowners, fuel suppliers, investors and regulators. New vessels, infrastructure upgrades and fuel supply investments are long-term commitments, making it critical to understand not only which fuels are available, but how they perform across their full life cycle.

For many organizations, these decisions involve substantial capital expenditures that may influence fleet operations and compliance strategies for years to come. Because vessels and fuel infrastructure may remain in service for decades, many organizations are evaluating future fuel pathways well before forthcoming emissions requirements take effect.

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Methanol has emerged as one of several alternative fuels being evaluated for commercial shipping, cruise operations and other large marine vessels. Yet the study found that methanol cannot be viewed as a single solution.

Across 15 production pathways, greenhouse gas performance varied significantly depending on factors such as feedstocks, hydrogen sourcing, electricity inputs and production methods.

Conducted by Ricardo, now a WSP company, the assessment combined the firm’s expertise in life cycle analysis, chemical engineering and maritime decarbonization to better understand how production choices influence greenhouse gas performance.

More importantly, it provides an evidence-based framework for organizations seeking to balance regulatory expectations, environmental objectives and major capital investment decisions.

Tim Scarbrough

United Kingdom

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Beyond the fuel label

As maritime stakeholders plan for a future shaped by increasingly stringent emissions reduction requirements, there is growing recognition that fuel labels alone provide only part of the picture. Understanding the full life cycle emissions associated with a fuel is becoming just as important as understanding how that fuel performs onboard a vessel.

The study’s most significant finding is straightforward: methanol’s climate performance depends heavily on its production pathway. Two fuels that are each labeled “methanol” may deliver very different outcomes when evaluated across their full life cycle.

“The question is not simply whether methanol can support decarbonization,” said Tim Scarbrough, director of maritime at WSP in the UK. “It’s also about understanding which pathways deliver the outcomes stakeholders seek, how those pathways can be evaluated consistently and how pathways could be optimized.”

This distinction matters because maritime organizations are making long-term investment decisions today. Whether considering new-build vessels, evaluating retrofit opportunities or developing future fuel supply strategies, stakeholders need confidence that their choices support both environmental objectives and business goals. Those decisions often involve substantial investments in vessels, engines, fuel storage systems and supporting infrastructure. Understanding how different pathways perform can help organizations identify opportunities that align environmental objectives with long-term business value.

Reliable life cycle data can help provide that confidence.

Surprising results

The study found that some emissions results are not as low as some observers might expect.

However, those figures reflect prescribed pathways and conservative assumptions intended to provide a consistent basis for comparison. They should be viewed as a benchmark for understanding performance differences rather than a limit on what future projects may achieve.

The study’s extensive sensitivity analyses, presented in the full report, detail how much lower the greenhouse gas footprint of methanol could be. These findings reinforce the importance of evaluating fuels within the context of their entire value chain rather than relying on broad assumptions about fuel categories.

A stronger foundation for future decisions

The maritime sector’s energy transition will require more than new fuels. It requires robust evidence.

Life cycle assessment helps regulators establish credible emissions frameworks. Developed for SGMF, the study contributes to broader discussions around life cycle emissions accounting and future maritime decarbonization strategies. It helps fuel suppliers understand the implications of production choices, supports vessel owners evaluating investment options and contributes to a more consistent industry understanding of what meaningful emissions reductions can look like in practice.

The future of maritime decarbonization may not be defined by choosing a single fuel. It may be defined by identifying the production pathways that deliver the greatest environmental and economic value, supported by the data and life cycle analysis needed to make informed decisions.