Road transportation still drives a huge share of emissions with 4.6 billion metric tons of CO2 in 2023, yet multiple parts of the system are changing fast. This post pulls together 2022 to 2023 figures across aviation, shipping, transit, biking, rail, and freight to show where progress is real and where the gaps stay stubborn.
Key Takeaways
- Global aviation emitted 1.03 billion tons of CO2 in 2023, representing 2.5% of total anthropogenic CO2 emissions
- Aircraft fuel burn efficiency improved by 25% from 2000 to 2022, saving 1.2 billion tons of CO2 cumulatively
- U.S. domestic aviation accounted for 2.1% of national GHG emissions in 2022, or 170 million tons CO2eq
- Maritime shipping emitted 1.05 billion tons CO2 in 2022, 3% of global total, with container ships at 40% share
- Slow steaming reduced shipping fuel use by 10% in 2023, avoiding 50 million tons CO2 amid high bunker prices
- LNG-fueled ships numbered 500 globally in 2023, cutting CO2 by 20% vs heavy fuel oil
- Public transit buses in U.S. cities carried 5 billion passengers in 2022, emitting 40 million tons CO2 total
- Bike-sharing systems globally provided 1 billion rides in 2023, avoiding 1.5 million tons CO2 vs car trips
- Electric buses in China numbered 600,000 by 2023, displacing 300 million tons diesel cumulatively
- Rail transport in the EU emitted only 0.4% of total GHG emissions in 2021, or 12 million tons CO2eq, despite 8% modal share
- High-speed rail in China carried 2.3 billion passengers in 2022, avoiding 320 million tons CO2 vs aviation/road alternatives
- U.S. freight rail efficiency: 479 ton-miles per gallon diesel, emitting 90% less CO2 than trucks per ton-mile
- In 2023, road transportation emitted 4.6 billion metric tons of CO2 globally, accounting for 24% of total energy-related CO2 emissions
- U.S. light-duty vehicles consumed 1.2 trillion liters of gasoline in 2022, contributing to 1.8 billion tons of CO2 emissions from road transport
- Heavy-duty trucks in Europe emitted 1.1 billion tons of CO2eq in 2021, representing 27% of the EU's transport emissions
Cleaner fuels, efficiency gains, and modal shifts are cutting transport emissions but global road and shipping growth remains a major challenge.
Related reading
01 · Category
Aviation15 stats
01
Global aviation emitted 1.03 billion tons of CO2 in 2023, representing 2.5% of total anthropogenic CO2 emissions
02
Aircraft fuel burn efficiency improved by 25% from 2000 to 2022, saving 1.2 billion tons of CO2 cumulatively
03
U.S. domestic aviation accounted for 2.1% of national GHG emissions in 2022, or 170 million tons CO2eq
04
Sustainable Aviation Fuel (SAF) production reached 600,000 tons in 2023, avoiding 1.5 million tons CO2 when used
05
Long-haul flights emit 3 times more CO2 per passenger-km than short-haul, with global long-haul at 70% of aviation emissions
06
ICAO's CORSIA scheme offset 25 million tons of CO2 from international aviation in 2023
07
Electric vertical takeoff vehicles (eVTOL) could reduce urban air mobility emissions by 50% vs helicopters by 2030
08
Aviation contrails contribute 57 million tons of CO2eq warming in 2022, potentially mitigable by 59% via routing changes
09
Global air cargo emitted 100 million tons CO2 in 2023, 10% of aviation total, driven by e-commerce growth
10
Biojet fuel blends reduced lifecycle emissions by 80% in 50+ commercial flights tested by 2023
11
EU aviation emissions grew 20% from 2013 to 2019, now capped under ETS at 2023 levels
12
Hydrogen-powered aircraft could cut aviation emissions 90% by 2050, per Airbus projections for 4,000 planes
13
Noise from aviation reduced by 10 dB since 1970, correlating with 50% fuel efficiency gains
14
International aviation bunker fuels emitted 920 million tons CO2 in 2022, excluded from national inventories
15
Aviation biofuel use reached 0.03% of jet fuel in 2022, but scaled to 450,000 tons CO2 avoided
Interpretation
Aviation Interpretation
In aviation, efficiency gains and cleaner fuel are starting to move the needle as aircraft fuel burn efficiency improved by 25% from 2000 to 2022 and SAF reached 600,000 tons in 2023 avoiding 1.5 million tons of CO2, yet long-haul flights still drive much of the impact with long-haul accounting for 70% of aviation emissions.
02 · Category
Maritime Transportation15 stats
01
Maritime shipping emitted 1.05 billion tons CO2 in 2022, 3% of global total, with container ships at 40% share
02
Slow steaming reduced shipping fuel use by 10% in 2023, avoiding 50 million tons CO2 amid high bunker prices
03
LNG-fueled ships numbered 500 globally in 2023, cutting CO2 by 20% vs heavy fuel oil
04
Ballast water management cut invasive species spread by 90%, indirectly supporting marine ecosystem sustainability
05
Wind-assisted propulsion on 20 ships in 2023 saved 5% fuel, or 100,000 tons CO2
06
Global shipping methane slip from engines totaled 1 million tons CH4 in 2022, equivalent to 25 million tons CO2eq
07
Ammonia as marine fuel could reduce lifecycle GHG by 70% by 2030 with green production
08
EU ETS now covers 50% of shipping emissions from 2024, targeting 40 million tons CO2 reduction by 2025
09
Ship recycling in compliant yards treated 98% of tonnage in 2023, reducing pollution vs beaching methods
10
Hydrogen-powered ferries in Norway avoided 20,000 tons CO2 in first year of operation 2022
11
Container ship capacity grew 4% in 2023, but efficiency gains kept CO2 intensity at 10 gCO2/ton-km
12
Bio-methanol bunkering started in 2023, with lifecycle emissions 65% below fossil methanol
13
Global cruise ships emitted 30 million tons CO2 in 2023, with shore power reducing port emissions 90%
14
Methanol dual-fuel engines ordered for 200 ships by 2024, potential 15 million tons CO2 savings yearly
15
Maritime scrubber installations on 4,000 ships by 2023 reduced SOx 90%, but increased black carbon
Interpretation
Maritime Transportation Interpretation
Maritime transportation is showing measurable progress as fuel and technology upgrades are cutting emissions, including LNG fueled ships reaching 500 vessels in 2023 and slow steaming reducing fuel use by 10% while preventing 50 million tons of CO2.
03 · Category
Public And Urban Mobility16 stats
01
Public transit buses in U.S. cities carried 5 billion passengers in 2022, emitting 40 million tons CO2 total
02
Bike-sharing systems globally provided 1 billion rides in 2023, avoiding 1.5 million tons CO2 vs car trips
03
Electric buses in China numbered 600,000 by 2023, displacing 300 million tons diesel cumulatively
04
Congestion pricing in London reduced car km by 30%, cutting urban transport CO2 by 200,000 tons yearly
05
Shared mobility apps cut urban vehicle ownership needs by 20%, per 2023 MIT study on 10 cities
06
Light rail systems in EU cities emit 50 gCO2/passenger-km, 70% less than cars
07
Micromobility (e-scooters/bikes) grew to 100 million trips in U.S. 2023, CO2 savings of 500,000 tons
08
Autonomous shuttles in Singapore trials reduced energy use 30% vs human-driven equivalents
09
Telecommuting post-COVID cut urban peak transport emissions 15% in 2022 across OECD cities
10
Metro systems worldwide carried 60 billion passengers in 2022, 90% lower emissions per km than buses
11
Car-free days in 100+ cities avoided 1 million tons CO2 in 2023 combined
12
Demand-responsive transit in rural U.S. improved efficiency 25%, reducing CO2 10% per trip
13
E-bike adoption in Europe reached 10 million units by 2023, saving 2 million tons CO2 annually
14
Urban freight consolidation hubs cut delivery vehicle km 40%, CO2 reduction 30% in pilots
15
Mobility-as-a-Service (MaaS) apps in Helsinki integrated modes, cutting emissions 15% for users
16
Public bus rapid transit (BRT) systems span 7,000 km globally, serving 35 million daily with low emissions
Interpretation
Public And Urban Mobility Interpretation
Public and urban mobility is cutting transport emissions at scale, from London’s congestion pricing cutting car kilometers by 30 percent and saving 200,000 tons of CO2 yearly to electric buses in China reaching 600,000 by 2023 and displacing 300 million tons of diesel cumulatively.
More related reading
04 · Category
Rail Transportation16 stats
01
Rail transport in the EU emitted only 0.4% of total GHG emissions in 2021, or 12 million tons CO2eq, despite 8% modal share
02
High-speed rail in China carried 2.3 billion passengers in 2022, avoiding 320 million tons CO2 vs aviation/road alternatives
03
U.S. freight rail efficiency: 479 ton-miles per gallon diesel, emitting 90% less CO2 than trucks per ton-mile
04
Electrified rail lines globally span 250,000 km, reducing energy use by 20-30% vs diesel
05
Indian Railways electrified 93% of broad-gauge network by 2023, cutting CO2 by 25 million tons annually
06
Hydrogen trains in Germany (Coradia iLint) operated 25,000 km by 2023, zero-emission equivalent to 4,000 tons diesel saved
07
Rail modal shift in Japan: Shinkansen avoids 10 million tons CO2 yearly vs cars/planes
08
Global rail CO2 intensity is 20 gCO2/t-km, vs 100g for trucks, enabling 80% lower emissions per freight ton-km
09
UK rail emissions per passenger-km fell 25% from 1990-2022 through electrification, to 35 gCO2
10
Battery-electric freight locomotives in U.S. trials cut emissions 95% on short hauls
11
Rail freight in Brazil grew 10% in 2022, emissions stable at 15 million tons CO2 due to efficiency gains
12
Digital signaling (ETCS) on EU rails saves 1.5% energy, or 500,000 tons CO2 yearly
13
African rail networks emit 50% less CO2 per ton-km than roads, but cover only 5% freight volume
14
Maglev trains in Shanghai achieve 0.12 kWh/passenger-km, 30% below conventional high-speed rail
15
Rail track recycling in Europe reused 98% of materials in 2022, saving 2 million tons CO2 from production
16
Rail passenger transport in India emitted 15 gCO2/pkm in 2022, vs 150g for cars
Interpretation
Rail Transportation Interpretation
Rail transportation is punching above its weight on climate impact, with only 0.4% of EU GHG emissions in 2021 despite an 8% modal share, showing how electrification and efficiency can cut emissions far beyond what its share of travel might suggest.
05 · Category
Road Transportation19 stats
01
In 2023, road transportation emitted 4.6 billion metric tons of CO2 globally, accounting for 24% of total energy-related CO2 emissions
02
U.S. light-duty vehicles consumed 1.2 trillion liters of gasoline in 2022, contributing to 1.8 billion tons of CO2 emissions from road transport
03
Heavy-duty trucks in Europe emitted 1.1 billion tons of CO2eq in 2021, representing 27% of the EU's transport emissions
04
Global road freight transport is projected to grow by 50% in CO2 emissions by 2050 without interventions, reaching 8 GtCO2
05
In China, passenger cars emitted 500 million tons of CO2 in 2022, up 15% from 2020 due to increased vehicle ownership
06
Electric vehicles in road transport reduced CO2 emissions by 120 million tons globally in 2023 compared to fossil fuel equivalents
07
India's road transport sector emitted 350 million tons of CO2 in FY2022, 14% of national total emissions
08
Biofuel blending in road transport saved 45 million tons of CO2 in Brazil in 2022, primarily from ethanol use
09
U.S. road transport fuel efficiency improved by 25% from 2005 to 2022, reducing emissions by 500 million tons cumulatively
10
In 2022, SUVs and light trucks made up 65% of new road vehicle sales in the U.S., emitting 20% more CO2 per mile than sedans
11
Global road transport NOx emissions totaled 20 million tons in 2021, with trucks contributing 60%
12
Hydrogen fuel cell vehicles in road fleets avoided 2 million tons of CO2 in Japan by 2023 since deployment start
13
EU road transport particulate matter (PM2.5) emissions fell 40% from 2010 to 2022 due to Euro 6 standards
14
In 2023, ride-hailing services in urban areas increased road CO2 emissions by 15% per passenger-km compared to public transit
15
Autonomous electric trucks could cut road freight emissions by 30% by 2040 through platooning, per ITF modeling
16
In 2022, road transportation in the U.S. was responsible for 1,800 million metric tons of CO2 emissions
17
Global passenger car fleet efficiency averaged 120 gCO2/km in 2023, down 2% from 2022
18
Truck platooning pilots in Europe achieved 10% fuel savings, equating to 5 million tons CO2 potential yearly
19
In 2023, BEVs comprised 18% of new car sales globally, avoiding 200 million tons CO2 over vehicle lifetimes
Interpretation
Road Transportation Interpretation
Road transportation remains a major climate driver with 4.6 billion metric tons of CO2 in 2023, about 24% of global energy related CO2 emissions, even as electric vehicles delivered 120 million tons of CO2 savings in 2023.
report visual · Breakdown
Aviation emissions and key decarbonization levers (percent shares + potential impact)
Aviation represents a measurable share of global emissions, while multiple technology pathways (fuel efficiency, SAF, and low-/zero-carbon fuels) can substantially reduce CO2 intensity and total impact over time.
2.1%
U.S. domestic aviation accounted for 2.1% of national GHG emissions in 2022, or 170 million tons CO2eq
98%
Ship recycling in compliant yards treated 98% of tonnage in 2023, reducing pollution vs beaching methods
Reference
Cite This Report
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APA
Stefan Wendt. (2026, February 13). Sustainability In The Transportation Industry Statistics. Gitnux. https://gitnux.org/sustainability-in-the-transportation-industry-statistics
MLA
Stefan Wendt. "Sustainability In The Transportation Industry Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/sustainability-in-the-transportation-industry-statistics.
Chicago
Stefan Wendt. 2026. "Sustainability In The Transportation Industry Statistics." Gitnux. https://gitnux.org/sustainability-in-the-transportation-industry-statistics.
Sources & references
61 datasets cited across this report · attribution is report-level