Imagine a silent polluter crossing the oceans, responsible for nearly 3% of the world's carbon dioxide emissions—that's the often-overlooked impact of the global shipping industry.
Key Takeaways
- International shipping accounted for 2.89% of total global anthropogenic CO2 emissions in 2018, equivalent to 1,056 million tonnes
- Total GHG emissions from international shipping reached 1,056 Mt CO2e in 2018, including CO2, CH4, and N2O
- Shipping emissions constituted approximately 13% of total transportation sector GHG emissions globally in 2019
- Container ships emitted 222 million tonnes of CO2 in 2018, 21% of shipping total
- Bulk carriers accounted for 15% of shipping CO2 emissions in 2018, totaling 158 Mt CO2
- Tankers emitted 308 million tonnes of CO2 in 2018, representing 29% of total shipping emissions
- Heavy fuel oil (HFO) powered 70% of global shipping emissions in 2018
- Marine gas oil (MGO) contributed to 15% of shipping fuel use in 2018
- LNG-fueled ships emitted 25-30% less CO2 than HFO equivalents per tonne-mile
- Asia accounted for 60% of global shipping CO2 emissions in 2018
- European waters saw 10% of shipping emissions in 2018, totaling 105 Mt CO2
- Intra-Asia routes emitted 250 Mt CO2 in 2018, 24% of total shipping
- Global shipping CO2 emissions grew 10% from 2012 to 2018
- Emissions per tonne-mile fell 12% from 2012-2018 due to efficiency
- Post-IMO 2020, SOx emissions dropped 77% globally in 2020
International shipping contributes a significant share of global emissions despite improving efficiency.
By Fuel and Technology
1Heavy fuel oil (HFO) powered 70% of global shipping emissions in 2018
Verified2Marine gas oil (MGO) contributed to 15% of shipping fuel use in 2018
Verified3LNG-fueled ships emitted 25-30% less CO2 than HFO equivalents per tonne-mile
Verified4Methanol as fuel reduces CO2 by up to 95% when green-produced
Directional5Ammonia fuel could cut GHG emissions by 85-95% in shipping by 2050
Single source6Biofuels in shipping reduced emissions by 76% lifecycle compared to fossil fuels
Verified7Scrubbers on ships reduced SOx by 80-90% but increased CO2 by 2-3.5%
Verified8Hybrid battery ships cut emissions by 20-30% on short routes
Verified9Wind-assisted propulsion reduces fuel use by 5-20% on bulk carriers
Directional10Air lubrication systems decrease drag, saving 4-8% fuel on large vessels
Single source11VLSFO became 80% of bunker fuel post-2020, reducing SOx
Verified12Hydrogen fuel cells in ships achieve 40% efficiency gain over diesel
Verified13Carbon capture on ships can reduce CO2 by 80-90%
Verified14Dual-fuel LNG ships numbered 500+ by 2023
Directional15Methanol dual-fuel orders reached 100 ships by 2023
Single source16ULSFO use 90% compliance post-2020
Verified17Battery-electric ferries zero-emission on 20+ routes
Verified18HFO sulfur content capped at 0.5% globally since 2020
Verified19Propeller upgrades save 5% fuel on 30% fleet
Directional20MGO emissions lower NOx by 20% vs HFO
Single source21Solar panels on ships generate 1-5% power savings
Verified22Warp drives (hull modifications) cut resistance 15%
Verified23Diesel-electric propulsion 10% more efficient
Verified24Flettner rotors save 8-12% fuel on retrofits
DirectionalBy Fuel and Technology Interpretation
The shipping industry is on a promising but comically convoluted path to decarbonization, swapping one dirty problem for another cleaner but imperfect one, as it juggles a bewildering array of partial solutions—from slashing sulfur with scrubbers that ironically boost CO2, to betting on future fuels like ammonia while retrofitting rotors to catch the wind—all while the stubborn specter of heavy fuel oil still looms over most of its emissions.
By Ship Type
1Container ships emitted 222 million tonnes of CO2 in 2018, 21% of shipping total
Verified2Bulk carriers accounted for 15% of shipping CO2 emissions in 2018, totaling 158 Mt CO2
Verified3Tankers emitted 308 million tonnes of CO2 in 2018, representing 29% of total shipping emissions
Verified4LNG carriers contributed 14 Mt CO2 in 2018, about 1.3% of shipping emissions
Directional5Passenger ships emitted 38 Mt CO2 in 2018, 3.6% of total shipping CO2
Single source6General cargo vessels produced 47 Mt CO2 emissions in 2018, 4.5% share
Verified7Ro-Ro cargo ships emitted 33 Mt CO2 in 2018, approximately 3.1% of shipping total
Verified8Chemical tankers accounted for 5% of shipping CO2 at 53 Mt in 2018
Verified9Offshore vessels emitted 17 Mt CO2 in 2018, 1.6% of total
Directional10Fishing vessels contributed around 20 Mt CO2 annually in recent years
Single source11Bulk carriers' CO2 intensity improved 1.5% annually 2012-2018
Verified12Tanker emissions share stable at 29% despite fleet growth
Verified13RoPax ferries emitted 0.025 gCO2/tonne-km in efficient operations
Verified14Cruise ships' CO2 per passenger-day is 3x higher than air travel
Directional15Oil tankers emitted 250 Mt CO2 in 2022, 25% share
Single source16LNG carrier fleet grew 20% yearly, emissions up 15%
Verified17Container fleet CO2 efficiency improved 25% since 2014
Verified18Dry bulk carriers 500 Mt deadweight emit 120 Mt CO2/year
Verified19Ferry emissions in EU 30 Mt CO2 annually
Directional20Car carriers emitted 25 Mt CO2 in 2018, 2.4% share
Single source21Reefers (reefer ships) 10 Mt CO2 annually
Verified22Tugs and supply vessels 15 Mt CO2, high in ports
Verified23Gas tankers 40 Mt CO2 in 2022, doubling since 2015
Verified24Cruise fleet emissions 50 Mt CO2 pre-COVID
Directional25Dredgers emit 5 Mt CO2 yearly globally
Single source26VLCC tankers average 15 gCO2/tonne-mile
Verified27Yachts and pleasure craft add 10 Mt CO2 unregulated
Verified28Naval vessels emissions estimated 20 Mt CO2 globally
VerifiedBy Ship Type Interpretation
The shipping industry floats a sobering truth: while container ships, tankers, and bulk carriers haul the heaviest emissions burden—with tankers alone belching out a quarter of the fleet's CO2—even the most efficient RoPax ferry can't wash away the fact that our global supply chain is still steaming ahead on a sea of fossil fuels.
Global Totals
1International shipping accounted for 2.89% of total global anthropogenic CO2 emissions in 2018, equivalent to 1,056 million tonnes
Verified2Total GHG emissions from international shipping reached 1,056 Mt CO2e in 2018, including CO2, CH4, and N2O
Verified3Shipping emissions constituted approximately 13% of total transportation sector GHG emissions globally in 2019
Verified4Global shipping CO2 emissions were estimated at 938 million tonnes in 2019, representing 2.5% of global energy-related CO2
Directional5In 2021, maritime transport emitted about 1 billion tonnes of CO2, roughly 3% of global CO2 emissions
Single source6Total annual SOx emissions from ships were 11.2 million tonnes in 2018 before IMO 2020 regulations
Verified7NOx emissions from international shipping totaled 14.4 million tonnes in 2018
Verified8Particulate matter (PM2.5) emissions from global shipping were 1.6 million tonnes in 2018
Verified9Black carbon emissions from shipping reached 0.2 million tonnes annually in 2018
Directional10Global shipping fuel consumption was 290 million tonnes of HFO in 2018, contributing to emissions
Single source11Container ship speeds dropped 12% from 2004-2019, cutting emissions
Verified12Total shipping CO2 hit 1,050 Mt in 2022, up from 2020 lows
Verified13Global fleet average age 12 years, older ships 20% higher emissions
Verified14Domestic shipping 10% of global emissions, often overlooked
DirectionalGlobal Totals Interpretation
International shipping serves up a 3% slice of the world's CO2 pie—a billion-tonne appetizer of soot, sulfur, and black carbon—which tastes like progress when you consider slowing ships and new rules, but leaves a bitter aftertaste when you remember our global fleet is aging like a polluting cheese.
Regional and Route-Based
1Asia accounted for 60% of global shipping CO2 emissions in 2018
Verified2European waters saw 10% of shipping emissions in 2018, totaling 105 Mt CO2
Verified3Intra-Asia routes emitted 250 Mt CO2 in 2018, 24% of total shipping
Verified4Trans-Pacific routes contributed 150 Mt CO2 annually
Directional5North Atlantic routes accounted for 80 Mt CO2 emissions in 2018
Single source6Middle East to Asia routes emitted 70 Mt CO2 in 2018
Verified7Baltic Sea shipping NOx emissions were 0.2 Mt in 2019
Verified8Mediterranean Sea contributed 5% of European shipping emissions
Verified9West Africa routes saw high PM emissions due to older fleets
Directional10Arctic shipping emissions projected to rise 4-fold by 2060
Single source11East Asia ports handled 40% of global container traffic, high emissions
Verified12Suez Canal traffic emitted 30 Mt CO2 annually pre-Ever Given
Verified13Panama Canal shipping CO2 around 20 Mt per year
Verified14Emissions in SECAs dropped 50% SOx after 2015 regulations
Directional15Europe shipping CO2 150 Mt in 2021, 14% global
Single source16Intra-regional Asia emissions 300 Mt CO2 yearly
Verified17North America ports 15% global emissions concentration
Verified18Indian Ocean routes 100 Mt CO2 from tanker traffic
Verified19Africa shipping emissions 5% global, rising with trade
Directional20Australia routes 40 Mt CO2 from bulk iron ore
Single source21South America intra-trade emissions 20 Mt CO2
Verified22Polar routes emissions doubled 2013-2019
Verified23Middle East bunker hubs supply 30% global fuel, high emissions
Verified24Transatlantic container emissions 50 Mt CO2 yearly
Directional25Caribbean routes high cruise emissions 15 Mt CO2
Single source26Black Sea shipping NOx 0.1 Mt yearly
VerifiedRegional and Route-Based Interpretation
While the world's seas are theoretically connected, a brutally efficient map of shipping pollution reveals Asia as the undeniable, soot-stained heart of the matter, with its own internal trade pumping out a quarter of the global fleet's CO2, while Europe fumes over its own substantial contribution and the Arctic prepares for a sooty, four-fold expansion of its own.
Trends and Policies
1Global shipping CO2 emissions grew 10% from 2012 to 2018
Verified2Emissions per tonne-mile fell 12% from 2012-2018 due to efficiency
Verified3Post-IMO 2020, SOx emissions dropped 77% globally in 2020
Verified4Shipping emissions declined 3.5% in 2020 due to COVID-19 slowdown
Directional5Projected shipping emissions to rise 50-250% by 2050 without action
Single source6EEDI reduced new ship emissions by 20% since 2013 implementation
Verified7CII regulation targets 40% reduction by 2030 from 2008 levels
Verified8FuelEU Maritime mandates 2% e-fuel uptake by 2025, rising to 80% by 2050
Verified9IMO strategy aims for net-zero shipping by or around 2050
Directional10Slow steaming saved 100 Mt CO2 annually since 2008 recession
Single source11Global shipping emissions rebounded 5% in 2021 post-COVID
Verified12Digital twins optimize routes, cutting fuel 10-15%
Verified13IMO GHG strategy benchmarks 2008 as 1,120 Mt CO2 baseline
Verified14EEXI retrofits target 10% CO2 reduction on 20,000+ ships
Directional15Ship recycling reduced emissions via efficiency gains 15%
Single source16Demand for shipping grew 3% yearly 2010-2019, driving emissions
Verified17EU ETS covers 50% shipping emissions from 2024
Verified18Just In Time arrival saves 5-10% fuel industry-wide
Verified19Mass flowering events reduce fleet emissions 2% temporarily
Directional20Green Corridor initiatives target 70% emission cuts by 2040
Single source21Capacity growth outpaced efficiency 2:1 2015-2020
VerifiedTrends and Policies Interpretation
While our ships have become leaner and cleaner in fits and starts, the stubborn growth in global trade means we're still sailing in circles unless we fully commit to the profound transformation demanded by our own ambitious targets.
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