800,000 Seafarers Short: The Workforce Question Behind Shipping’s Net-Zero Bet
Shipping is placing one of the biggest regulatory bets in its history. Almost nobody is talking about who’s actually going to run the ships once it lands.
Written by Lidia Slawinska, Communications Manager – Escola Europea Intermodal Transport
In April 2025, the International Maritime Organization approved the first global framework requiring the shipping industry to cut its greenhouse gas emissions on a legally binding timeline — a Net-Zero Framework covering every oceangoing ship over 5,000 gross tonnage. Ships will have to report their fuel emissions intensity annually, meet progressively stricter limits, and either adopt cleaner fuels or pay into a compliance fund that finances the transition industry-wide. Formal adoption, originally expected in October 2025, has since been pushed into 2026, but the direction isn’t in question: the industry is decarbonizing, on a clock it doesn’t fully control.
What the framework’s supporters rarely dwell on is who’s going to crew this transition.
That’s not a hypothetical for some future decade, either. The industry’s own 2026 Seafarer Workforce Report, published by BIMCO and the International Chamber of Shipping in June, puts the current global seafarer workforce at 2.57 million people crewing 85,148 merchant ships — and finds it’s already short by 39,100 STCW-certified officers this year. Demand for officers has climbed 23.1% since 2021, for ratings 46.3%. Left unaddressed, the same report projects the industry will need 113,735 additional officers by 2030, just to keep the existing fleet running — before a single net-zero fuel enters the equation.
Research commissioned for the Maritime Just Transition Task Force estimates that
roughly 800,000 seafarers will need additional training by the mid-2030s to safely operate vessels running on zero or near-zero emission fuels.
That’s not a rounding error, on a workforce that’s already stretched thin. It’s a training and hiring problem roughly the size of a mid-sized country’s active military, layered on top of a shortage the industry hasn’t solved yet.
Not just new fuels — new skills
The gap isn’t just about learning to handle ammonia or methanol instead of heavy fuel oil, either. A 2026 academic study mapping “twin transition” skills — green and digital competencies together — across maritime firms in Bulgaria, Cyprus and Greece found that 83% of the skills most in demand for the industry’s highest-priority roles combine environmental knowledge with technical or digital ones: reading emissions data, managing automated systems, understanding regulatory standards well enough to keep a ship compliant, not just afloat.
Roughly a third of in-demand skills were purely environmental, another quarter purely digital, and the rest — the hardest roles to hire for — required both at once. Employers in the study reported persistent difficulty recruiting for exactly these blended positions, at every level from engineering officers with master’s degrees to vocationally trained technical crew.
The Maritime Just Transition Task Force was established at COP26 in 2021 by shipowners, seafarer unions and the IMO together — built on the principle that decarbonization should leave “no one behind.”
The fleet is already changing
The pressure isn’t waiting for the mid-2030s to arrive. DNV’s newbuild data shows alternative-fuel vessels accounted for 38% of the gross tonnage ordered in 2025 — 188 LNG-fuelled ships alone made up 31% of that, alongside 61 methanol orders (down from 149 the year before) and only limited uptake so far for ammonia and LPG. Compare that to the ships already on the water: as of August 2025, DNV counted 1,794 alternative-fuel-capable vessels in operation, against a global fleet of over 85,000 merchant ships — roughly 2%. Every new vessel ordered today needs a crew that can run it safely well before its keel is even laid, which means the training has to arrive faster than the ships do, not after them.
Regulators are racing the same clock
To their credit, regulators and unions both seem to know the clock is the problem. The IMO is revising the STCW — the international treaty setting minimum seafarer training standards — with input from shipowners and the International Transport Workers’ Federation, whose General Secretary Stephen Cotton has framed the moment as an opportunity rather than a threat:
“Seafarers are ready to lead, they are ready to shape the training frameworks for the zero carbon fuels of the future.”
A baseline training framework was slated for completion by mid-2025, with pilot testing beginning in Asia ahead of wider rollout. Whether “no one is left behind” turns out to be true will depend less on the regulation itself than on how fast training capacity can actually scale to meet it.
Training is starting to catch up
Some of the response is already visible. The IMO’s GreenVoyage2050 programme, working with GIZ’s International Power-to-X Hub, launched a Training-of-Trainers programme in July 2025 to build local capacity for teaching alternative-fuel safety in developing countries. Alongside it, the Global Industry Alliance to Support Low Carbon Shipping has built an Alternative Fuels Learning Portal for seafarers, harbour masters, shore staff and policymakers — its methanol module went live at the end of 2025, with ammonia and hydrogen modules due through 2026. Classification societies are moving in parallel: DNV runs its own Maritime Academy with dedicated alternative-fuels coursework for the surveyors and crew who’ll certify and operate these ships. None of it closes a six-figure gap by itself. But it’s a reasonable sketch of what closing it will actually take: coordinated, sustained, and running years ahead of the regulation’s own deadlines.
A logistics problem, in the most literal sense
It’s a useful reminder, for anyone in the business of training people for ports and ships, that the hardest problems in a transition like this one aren’t only technical. They’re logistical, in the most literal sense: getting the right training to the right people before a deadline that’s already been set — and, increasingly, before a shortage that’s already here.
