Transport emissions and pathways
28% of global CO₂ — and three very different sub-problems
Transport is deceptive — it sounds like one problem but it is three distinct problems with three different solutions. Passenger cars are being electrified at speed. Long-distance trucks, ships, and aircraft need energy-dense fuels that batteries cannot yet provide. Each sub-sector has a different timeline, different economics, and different technology trajectory.
40 M
EVs sold globally 2023 (IEA) — 18% of new car sales
2023
BYD overtook Tesla as world's largest EV seller
Net zero 2050
Both IATA (aviation) and IMO (shipping) targets
Methanol
Maersk's Laura Maersk — world's first green methanol ship 2023
Road transport
Passenger EVs and the heavy truck challenge
Passenger EV revolution:
The passenger EV transition is happening faster than almost all models predicted. In 2023: approximately 40 million EVs were sold globally (IEA), representing approximately 18% of all new car sales. China leads — approximately 60% of global EV sales, with BYD (Shenzhen, 22.54°N 114.06°E) overtaking Tesla in total EV sales in 2023. Norway has already reached approximately 90% EV new car market share. California, the Netherlands, and Germany are all above 20%. India: EV penetration is approximately 5–6% of new two-wheelers and 2–3% of passenger cars (2023, SIAM India). Tata Motors Nexon EV is the best-selling EV; Ola Electric leads two-wheeler EVs. Battery cost reduction is the primary driver — cells below $90/kWh now enable EVs to reach purchase price parity with ICE vehicles in several markets, especially in China. Source: IEA Global EV Outlook 2024 · BloombergNEF BNEF EV Outlook 2024.
The passenger EV transition is happening faster than almost all models predicted. In 2023: approximately 40 million EVs were sold globally (IEA), representing approximately 18% of all new car sales. China leads — approximately 60% of global EV sales, with BYD (Shenzhen, 22.54°N 114.06°E) overtaking Tesla in total EV sales in 2023. Norway has already reached approximately 90% EV new car market share. California, the Netherlands, and Germany are all above 20%. India: EV penetration is approximately 5–6% of new two-wheelers and 2–3% of passenger cars (2023, SIAM India). Tata Motors Nexon EV is the best-selling EV; Ola Electric leads two-wheeler EVs. Battery cost reduction is the primary driver — cells below $90/kWh now enable EVs to reach purchase price parity with ICE vehicles in several markets, especially in China. Source: IEA Global EV Outlook 2024 · BloombergNEF BNEF EV Outlook 2024.
Heavy trucks — batteries vs hydrogen:
Long-haul heavy freight trucks (40-tonne articulated lorries) are harder to electrify — they require approximately 3–5× the energy per km of a passenger car and drive very long distances without stopping. Two credible pathways: (1) Battery-electric (BEV) trucks: Daimler eActros 600 (650 km range, 600 kWh battery, 44-tonne), Tesla Semi (500 mile range, Pepsi operates 100+ units in California delivery). BEV trucks viable for fixed routes, depot charging, urban/regional delivery (<500 km). (2) Hydrogen FCEV trucks: Hyundai Xcient (35.27°N 128.88°E HQ, 180 kW fuel cell, 190 km range, 50+ operating in Switzerland), Toyota Project Portal California. FCEV trucks have advantage for long-haul (>500 km) and heavy loads where battery weight is prohibitive. But hydrogen fuelling infrastructure is the bottleneck. Nikola Motor (hydrogen truck pioneer) filed for Chapter 7 bankruptcy in 2024 — casualty of founder fraud and execution failure, not proof that hydrogen trucks don't work. Source: Daimler Trucks AR 2023 · Hyundai Motor AR 2023.
Long-haul heavy freight trucks (40-tonne articulated lorries) are harder to electrify — they require approximately 3–5× the energy per km of a passenger car and drive very long distances without stopping. Two credible pathways: (1) Battery-electric (BEV) trucks: Daimler eActros 600 (650 km range, 600 kWh battery, 44-tonne), Tesla Semi (500 mile range, Pepsi operates 100+ units in California delivery). BEV trucks viable for fixed routes, depot charging, urban/regional delivery (<500 km). (2) Hydrogen FCEV trucks: Hyundai Xcient (35.27°N 128.88°E HQ, 180 kW fuel cell, 190 km range, 50+ operating in Switzerland), Toyota Project Portal California. FCEV trucks have advantage for long-haul (>500 km) and heavy loads where battery weight is prohibitive. But hydrogen fuelling infrastructure is the bottleneck. Nikola Motor (hydrogen truck pioneer) filed for Chapter 7 bankruptcy in 2024 — casualty of founder fraud and execution failure, not proof that hydrogen trucks don't work. Source: Daimler Trucks AR 2023 · Hyundai Motor AR 2023.
Shipping and aviation — the hard problems
Green shipping fuels and aviation's SAF challenge
Green shipping — methanol, ammonia, and wind:
Shipping carries approximately 90% of global trade by volume and emits approximately 11% of transport CO₂ (approximately 940 MT CO₂/yr, IMO). IMO GHG Strategy (2023): net zero well before 2050. The challenge: what clean fuel can power a large container ship across the Pacific? Candidates: Green methanol — Maersk's Laura Maersk (delivered September 2023) is the world's first methanol-powered container ship, a 2,100 TEU feeder. Maersk has ordered 19 large methanol ships. Green methanol requires green hydrogen + captured CO₂ (e-methanol) or bio-methanol. Green ammonia — MAN Energy Solutions and Wärtsilä are developing dual-fuel ammonia marine engines, targeting commercial availability by 2025. Ammonia is toxic and requires very different handling than conventional fuels. LNG: Approximately 700 LNG-fuelled ships operational — a bridge fuel (reduces SOx/NOx/PM but only modest CO₂ reduction vs HFO). Wind assist (Flettner rotor sails): Bound4Blue SuarFlap, Norsepower rotor sails — spinning columns that use Magnus effect to provide supplemental propulsion; 5–30% fuel savings. Source: IMO GHG Strategy 2023 · Maersk AR 2023.
Shipping carries approximately 90% of global trade by volume and emits approximately 11% of transport CO₂ (approximately 940 MT CO₂/yr, IMO). IMO GHG Strategy (2023): net zero well before 2050. The challenge: what clean fuel can power a large container ship across the Pacific? Candidates: Green methanol — Maersk's Laura Maersk (delivered September 2023) is the world's first methanol-powered container ship, a 2,100 TEU feeder. Maersk has ordered 19 large methanol ships. Green methanol requires green hydrogen + captured CO₂ (e-methanol) or bio-methanol. Green ammonia — MAN Energy Solutions and Wärtsilä are developing dual-fuel ammonia marine engines, targeting commercial availability by 2025. Ammonia is toxic and requires very different handling than conventional fuels. LNG: Approximately 700 LNG-fuelled ships operational — a bridge fuel (reduces SOx/NOx/PM but only modest CO₂ reduction vs HFO). Wind assist (Flettner rotor sails): Bound4Blue SuarFlap, Norsepower rotor sails — spinning columns that use Magnus effect to provide supplemental propulsion; 5–30% fuel savings. Source: IMO GHG Strategy 2023 · Maersk AR 2023.
Aviation — SAF, hydrogen, and electric:
Aviation emits approximately 2.5% of global CO₂ but is responsible for approximately 3.5–4% of effective radiative forcing (including contrails and NOx). Commercial aviation cannot be battery-electrified for medium or long-haul routes — jet fuel has 43 MJ/kg vs Li-ion battery's 0.9 MJ/kg. Three pathways: (1) SAF (Sustainable Aviation Fuel) — the only near-term solution; can be used in existing aircraft engines without modification; IATA targets 65% of aviation fuel as SAF by 2050 (from 0.1% today). Neste Porvoo (60.40°N 25.65°E), World Energy Paramount (33.77°N 118.19°W), TotalEnergies are leading SAF producers. EU ReFuelEU mandates 2% SAF from 2025 rising to 70% by 2050. (2) Hydrogen aircraft — Airbus ZEROe programme targets regional turboprop aircraft using liquid hydrogen by 2035, long-haul by 2040. Technical challenges: liquid H₂ at −253°C, 4× the volume of jet fuel. (3) Electric aircraft — viable for <500 km regional routes; Eviation Alice (18 passengers, 440 km range), Heart Aerospace ES-30 (30 passengers, 200 km), Pipistrel Velis Electro (certified). Source: IATA SAF Report 2024 · Airbus ZEROe documentation.
Aviation emits approximately 2.5% of global CO₂ but is responsible for approximately 3.5–4% of effective radiative forcing (including contrails and NOx). Commercial aviation cannot be battery-electrified for medium or long-haul routes — jet fuel has 43 MJ/kg vs Li-ion battery's 0.9 MJ/kg. Three pathways: (1) SAF (Sustainable Aviation Fuel) — the only near-term solution; can be used in existing aircraft engines without modification; IATA targets 65% of aviation fuel as SAF by 2050 (from 0.1% today). Neste Porvoo (60.40°N 25.65°E), World Energy Paramount (33.77°N 118.19°W), TotalEnergies are leading SAF producers. EU ReFuelEU mandates 2% SAF from 2025 rising to 70% by 2050. (2) Hydrogen aircraft — Airbus ZEROe programme targets regional turboprop aircraft using liquid hydrogen by 2035, long-haul by 2040. Technical challenges: liquid H₂ at −253°C, 4× the volume of jet fuel. (3) Electric aircraft — viable for <500 km regional routes; Eviation Alice (18 passengers, 440 km range), Heart Aerospace ES-30 (30 passengers, 200 km), Pipistrel Velis Electro (certified). Source: IATA SAF Report 2024 · Airbus ZEROe documentation.
Questions
Questions about transport decarbonisation
When will EVs reach price parity with petrol cars without subsidies?
EV-ICE purchase price parity (without subsidies) has already been achieved in China for many models — BYD's Seagull retails at approximately CNY 75,000 (~$10,300) for a 300 km range urban car, directly competitive with entry-level ICE hatchbacks. In Europe and the USA, purchase price parity depends heavily on vehicle segment and battery size. BloombergNEF's annual EV Outlook (2024) projects: (1) Small urban EVs: already at parity in China (2023), Europe ~2024–2026, USA ~2026–2028. (2) Medium sedans/SUVs: Europe ~2025–2027, USA ~2026–2028. (3) Large long-range EVs: Europe ~2027–2029, USA ~2028–2030. (4) Pickup trucks (critical in the USA): ~2030+. The key driver: battery cell cost falling below $80–90/kWh makes total vehicle BOM (bill of materials) cost equivalent to ICE. LFP cells from CATL are already below $90/kWh at cell level. The important caveat: purchase price parity is not the same as total cost of ownership (TCO) parity. EVs already have lower TCO (lower fuel, lower maintenance) in most markets because electricity is cheaper than petrol per km driven. The barrier is the higher upfront purchase price — addressed by subsidies, green auto loans, and falling battery costs. India: NITI Aayog and Rocky Mountain Institute project EV-ICE TCO parity for two-wheelers in India by 2025, three-wheelers/buses by 2025, and passenger cars by 2030. Source: BloombergNEF BNEF EV Outlook 2024 · NITI Aayog EV Cost Analysis · IEA Global EV Outlook 2024.
Provenance
Attribution and citation
- Sources
- IEA Global EV Outlook 2024 · BloombergNEF EV Outlook 2024 · IMO GHG Strategy 2023 · IATA SAF Report 2024 · Maersk Annual Report 2023 · Hyundai Motor AR 2023 · NITI Aayog EV Cost Analysis India
- Cite as
- "Transport Decarbonisation — EVs, Hydrogen Trucks, Green Shipping", The Energy Codex, https://thecodex.expert/energy/transport-decarbonisation/, last updated .