International shipping emitted about 963 million tonnes of CO2 in 2022 from fuel combustion, and that is only the start of the picture when you connect fuel use to the rules now tightening in Europe and under IMO. The real tension is in the gaps that keep zero-carbon fuels from competing, alongside compliance mechanics like SEEMP Part III reporting and EEXI limits that force measurable efficiency improvements. By the time you factor in lifecycle hydrogen outcomes and operational levers like speed and routing, emissions statistics stop being an annual headline and start looking like a lever by lever roadmap.
Key Takeaways
- The cost premium for alternative fuels over marine gasoil/HFO is a key determinant in decarbonization; scenario analyses quantify price gaps that must narrow to make zero-carbon fuels competitive (IEA reported deltas)
- The market share of vessels using LNG as a marine fuel is estimated in industry analyses at single digits percent of the global fleet by 2023 (vessel-count-based estimates)
- Alternative fuels investment needs for shipping are estimated at hundreds of billions of dollars by mid-century in scenario analyses (global capex needs)
- Hydrogen fuel-cell ships are estimated to reach net-zero CO2 at point of use, but lifecycle depends on hydrogen color (reported lifecycle ranges)
- International maritime emissions are reported to be dominated by CO2 from fuel combustion; fuel consumption is the basis of CO2 estimates (reported in IMO DCS methodology)
- Ship Energy Efficiency Management Plan (SEEMP) required under IMO MARPOL for ships to manage energy efficiency (SEEMP Part III data reporting)
- Vessels rated E must submit a corrective action plan addressing measures to achieve improvement (rule-based compliance requirement)
- EU ETS shipping reaches full coverage (100%) after the phase-in period (per directive rules)
- IMO Target: reduce GHG by at least 50% by 2050 compared with 2008 (absolute reduction target embedded in strategy)
- In FuelEU Maritime, the required reduction in lifecycle GHG intensity is specified in staged increments across 2025, 2030, and later years (schedule in regulation text)
- Non-CO2 effects can be significant over shorter time scales in climate impact assessments; models quantify their relative magnitude to CO2 in the results (fractional contribution values reported)
- In 2022, international shipping emitted about 963 million tonnes of CO2 from fuel combustion, according to the International Energy Agency’s sector tracking in its shipping dataset.
- 2022 CO2 emissions per tonne-mile from international shipping were ~0.011 kg CO2/tonne-mile (an order-of-magnitude intensity metric derived from aggregated fleet fuel use and activity).
- In 2023, global seaborne trade was about 12.7 billion tonnes, implying continuing demand for shipping services that drives fuel consumption and emissions.
- The world container fleet carried about 24.3 million TEU capacity in 2023, reflecting the scale of containerized cargo demand tied to fuel burn.
Shipping emissions cut depends on tightening fuel and efficiency gaps through IMO and EU rules, aided by zero carbon fuel cost declines.
Related reading
01 · Category
Cost Analysis6 stats
01
The cost premium for alternative fuels over marine gasoil/HFO is a key determinant in decarbonization; scenario analyses quantify price gaps that must narrow to make zero-carbon fuels competitive (IEA reported deltas)
02
The market share of vessels using LNG as a marine fuel is estimated in industry analyses at single digits percent of the global fleet by 2023 (vessel-count-based estimates)
03
Alternative fuels investment needs for shipping are estimated at hundreds of billions of dollars by mid-century in scenario analyses (global capex needs)
04
Fuel cost is typically the largest operating cost component for container shipping lines (fuel often ~40–60% of operating costs depending on route and cycle; reported in line financial analyses)
05
NOx technology cost impacts: marine SCR retrofit cost is reported in the hundreds of thousands to low millions of USD per vessel depending on installation scope (cost bands from retrofits studies)
06
FuelEU Maritime compliance cost burden is estimated to be material for fleets depending on fuel price differentials; scenario analyses quantify annual incremental costs in the billions of euros at fleet level (European Commission impact assessment)
Interpretation
Cost Analysis Interpretation
From a cost analysis perspective, decarbonization hinges on price gaps that must narrow because fuel already drives roughly 40 to 60 percent of container shipping operating costs, while current LNG adoption remains only at single-digit shares and meeting FuelEU Maritime can add billions of euros in annual incremental compliance costs at the fleet level.
02 · Category
Technology & Operational1 stats
01
Hydrogen fuel-cell ships are estimated to reach net-zero CO2 at point of use, but lifecycle depends on hydrogen color (reported lifecycle ranges)
Interpretation
Technology & Operational Interpretation
For the Technology and Operational angle, hydrogen fuel cell ships could achieve net zero CO2 at the point of use, but their true lifecycle outcome will vary widely depending on the hydrogen color, with reported lifecycle ranges making the technology performance highly operationally dependent.
03 · Category
Measurement & Reporting8 stats
01
International maritime emissions are reported to be dominated by CO2 from fuel combustion; fuel consumption is the basis of CO2 estimates (reported in IMO DCS methodology)
02
Ship Energy Efficiency Management Plan (SEEMP) required under IMO MARPOL for ships to manage energy efficiency (SEEMP Part III data reporting)
03
Vessels rated E must submit a corrective action plan addressing measures to achieve improvement (rule-based compliance requirement)
04
EEXI compliance uses an Energy Efficiency Existing Ship Index measurement, requiring calculation based on attained EEXI compared to required limits
05
EU MRV reporting requires “fuel oil consumption” and “distance sailed” by ship voyage (mandatory data fields include total time at sea and ports)
06
Under EU ETS, maritime emissions are reported using monitoring plans and verified emissions reports for covered vessels (verification requirement)
07
A 1% improvement in operational energy efficiency can translate to significant CO2 reductions proportional to fuel use (reported relation using Ship Energy Efficiency operational metrics)
08
EU MRV includes verified “CO2 emissions” derived from fuel consumption using default emission factors specified in implementing acts
Interpretation
Measurement & Reporting Interpretation
Under Measurement and Reporting, the system largely ties shipping emission estimates to tracked fuel consumption and voyage data, where even a 1% operational efficiency gain can drive proportionate CO2 cuts and EU reporting turns this into verified CO2 and ETS-checked figures using default emission factors.
04 · Category
Policy & Markets7 stats
01
EU ETS shipping reaches full coverage (100%) after the phase-in period (per directive rules)
02
IMO Target: reduce GHG by at least 50% by 2050 compared with 2008 (absolute reduction target embedded in strategy)
03
In FuelEU Maritime, the required reduction in lifecycle GHG intensity is specified in staged increments across 2025, 2030, and later years (schedule in regulation text)
04
The IMO EEXI and CII are mandatory compliance measures for the international fleet, adopted through MARPOL amendments
05
The EU’s CBAM does not directly price maritime operations, but it affects related carbon-intensive goods (iron/steel, cement, fertilizers, aluminum, electricity) that shipping transports; coverage starts 1 October 2023
06
IEA estimates international shipping accounts for ~2–3% of global CO2 emissions and that decarbonization requires large-scale fuel and efficiency changes (sector summary statistic)
07
EEXI solutions include technical measures and engine power limitation, as defined under IMO implementation guidance
Interpretation
Policy & Markets Interpretation
Under Policy and Markets, rules are tightening quickly as EU ETS shipping hits full 100% coverage after the phase in while IMO sets a 50% by 2050 GHG cut target, and FuelEU Maritime and MARPOL based compliance like EEXI and CII progressively raise the bar for the international fleet.
05 · Category
Emissions Scale1 stats
01
Non-CO2 effects can be significant over shorter time scales in climate impact assessments; models quantify their relative magnitude to CO2 in the results (fractional contribution values reported)
Interpretation
Emissions Scale Interpretation
Under the Emissions Scale category, the key takeaway is that non-CO2 effects can make a sizable difference over shorter time horizons, with models explicitly reporting their fractional contribution relative to CO2 in the results.
More related reading
06 · Category
Emissions Baselines2 stats
01
In 2022, international shipping emitted about 963 million tonnes of CO2 from fuel combustion, according to the International Energy Agency’s sector tracking in its shipping dataset.
02
2022 CO2 emissions per tonne-mile from international shipping were ~0.011 kg CO2/tonne-mile (an order-of-magnitude intensity metric derived from aggregated fleet fuel use and activity).
Interpretation
Emissions Baselines Interpretation
As an emissions baseline for the sector, international shipping in 2022 released about 963 million tonnes of CO2 from fuel combustion and produced roughly 0.011 kg of CO2 per tonne-mile, setting a clear reference point for tracking how future changes in activity and fuel efficiency shift overall shipping impacts.
07 · Category
Fleet & Demand2 stats
01
In 2023, global seaborne trade was about 12.7 billion tonnes, implying continuing demand for shipping services that drives fuel consumption and emissions.
02
The world container fleet carried about 24.3 million TEU capacity in 2023, reflecting the scale of containerized cargo demand tied to fuel burn.
Interpretation
Fleet & Demand Interpretation
In the Fleet and Demand picture, global seaborne trade reached about 12.7 billion tonnes in 2023, and the container fleet still stood at roughly 24.3 million TEU, signaling sustained cargo demand that keeps fuel use and shipping emissions firmly linked to the scale of the fleet.
08 · Category
Fuel & Technology2 stats
01
In 2023, LNG-powered ships accounted for about 5% of the global LNG-fueled fleet deliveries/active orderbook share (industry tracking estimate of adoption headroom).
02
A life-cycle assessment for shipping highlights that well-to-wake emissions for hydrogen vary widely: low-carbon hydrogen can deliver multiple-fold reductions versus conventional fuels while unabated grey hydrogen can erase much of the benefit (range depends on supply chain).
Interpretation
Fuel & Technology Interpretation
From a Fuel & Technology perspective, LNG-powered ships still make up only about 5% of the global LNG-fueled fleet deliveries and active orderbook share in 2023, suggesting early adoption, while hydrogen’s well-to-wake impact can swing from multiple-fold reductions with low-carbon supply to largely negating benefits with unabated grey hydrogen.
09 · Category
Regulation & Compliance4 stats
01
A 2023 peer-reviewed analysis found that shipping NOx abatement via SCR can reduce NOx emissions by about 70–95% depending on operating conditions and catalyst performance.
02
A 2021–2022 industry compliance review reports that scrubber retrofit lead times commonly range from ~6 to 12 months after main contracting, affecting emissions compliance timelines.
03
The EU FuelEU Maritime regulation requires ships to reduce lifecycle GHG intensity starting in 2025, with progressively tighter reduction factors in subsequent years.
04
IMO’s Data Collection System (DCS) requires submission for calendar-year 2024 by 31 May 2025 (per typical reporting deadlines applied to DCS cycle).
Interpretation
Regulation & Compliance Interpretation
For Regulation and Compliance, shipping is moving from technology performance to hard reporting and timetable pressure, with SCR cutting NOx by about 70 to 95 percent while EU FuelEU GHG intensity steps tighten from 2025 and DCS submissions for 2024 are due by 31 May 2025, leaving limited room for retrofit delays that can run roughly 6 to 12 months.
10 · Category
Operational Efficiency6 stats
01
A 2023 peer-reviewed study quantified that speed reduction strategies can reduce fuel consumption roughly with the cube of speed (i.e., a ~10% speed reduction can yield about ~27% lower fuel burn under typical resistance assumptions).
02
A 2020 study reported that weather routing and voyage optimization can reduce fuel consumption by about 2–5% for participating routes (depending on route length and meteorological variability).
03
In a 2022 real-world demonstration, hull and propeller surface cleaning and improved maintenance achieved about 1–3% fuel savings for bulk carriers on average.
04
A peer-reviewed paper estimates that propeller polishing and low-friction coatings can reduce frictional resistance and lead to ~1–6% fuel savings depending on coating durability and hull condition.
05
A 2021 technical review found that improving route efficiency and avoiding congestion can reduce emissions by several percent; one reported case study achieved ~3–6% reduction by reducing engine running time and detours.
06
In 2023, the IMO’s GHG study updates reported that the combined technical efficiency measures (e.g., EEDI/EEXI class improvements) have potential to reduce fuel consumption and CO2 by several percent across the fleet relative to baseline assumptions.
Interpretation
Operational Efficiency Interpretation
Operational efficiency stands out because measures that optimize how ships run can deliver outsized fuel and CO2 benefits, from roughly a 27% fuel-burn cut from a 10% speed reduction to typical 1 to 5% gains from weather routing, hull and propeller maintenance, and friction reduction, with IMO technical efficiency updates suggesting several percent reductions fleetwide.
Reference
Cite This Report
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APA
Emilia Santos. (2026, February 13). Shipping Emissions Statistics. Gitnux. https://gitnux.org/shipping-emissions-statistics
MLA
Emilia Santos. "Shipping Emissions Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/shipping-emissions-statistics.
Chicago
Emilia Santos. 2026. "Shipping Emissions Statistics." Gitnux. https://gitnux.org/shipping-emissions-statistics.
Sources & references
39 datasets cited across this report · attribution is report-level
+25 additional datasets cited (not shown individually)