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Transport Sector Summary: Climate Change 2014

Core Content

The Transport chapter of the Climate Change 2014: Mitigation of Climate Change report provides a comprehensive analysis of the transport sector's role in greenhouse gas (GHG) emissions, mitigation strategies, and the challenges and opportunities for reducing emissions globally.

Main Authors and Contributors

• Coordinating Lead Authors: Ralph Sims (New Zealand), Roberto Schaeffer (Brazil)
• Lead Authors: Felix Creutzig (Germany), Xochitl Cruz-Núñez (Mexico), Marcio D'Agosto (Brazil), Delia Dimitriu (Romania/UK), Maria Josefina Figueroa Meza (Venezuela/Denmark), Lew Fulton (USA), Shigeki Kobayashi (Japan), Oliver Lah (Germany), Alan McKinnon (UK/Germany), Peter Newman (Australia), Minggao Ouyang (China), James Jay Schauer (USA), Daniel Sperling (USA), Geetam Tiwari (India)
• Contributing Authors: Adjo A. Amekudzi (USA), Bruno Soares Moreira Cesar Borba (Brazil), Helena Chum (Brazil/USA), Philippe Crist (France/USA), Han Hao (China), Jennifer Helfrich (USA), Thomas Longden (Australia/Italy), André Frossard Pereira de Lucena (Brazil), Paul Peeters (Netherlands), Richard Plevin (USA), Steve Plotkin (USA), Robert Sausen (Germany)
• Review Editors: Elizabeth Deakin (USA), Suzana Kahn Ribeiro (Brazil)
• Chapter Science Assistant: Bruno Soares Moreira Cesar Borba (Brazil)

Key Information

8.1 Freight and Passenger Transport (Land, Air, Sea and Water)

• Global transport GHG emissions more than doubled since 1970, reaching 7.0 GtCO₂eq in 2010.
• Road transport accounts for ~80% of this increase.
• Transport emissions are closely linked to GDP growth, with evidence of decoupling emerging in some OECD countries.
• In developing countries, transport activity is expected to grow rapidly due to rising incomes and infrastructure development.
• Non-OECD countries will likely see continued growth in transport emissions, but OECD countries may peak LDV travel by 2035.

8.1.1 The Context for Transport of Passengers and Freight

• 10% of the global population accounts for 80% of motorized passenger-kilometres (p-km).
• OECD countries dominate transport GHG emissions, but recent growth is mainly in Asia.
• Low GHG emitting 2- to 3-wheelers have more than doubled in usage since 2000 in Asia.
• Sustainable transport aims to meet mobility needs while reducing GHG emissions through modal shift and decoupling from oil dependence.

8.1.2 Energy Demands and Direct/Indirect Emissions

• 53% of global primary oil consumption is used for transport, with biofuels, electricity, and natural gas contributing 2%, 1%, and 3% respectively.
• Light-duty vehicles (LDVs) consume about half of all transport energy.
• Aviation accounts for 51% of international passenger arrivals and 17% of tourist travel.
• Freight transport consumes ~45% of total transport energy, with heavy-duty vehicles (HDVs) using over half of that.
• Waterborne transport has a wide range of emissions due to varying boat types and sizes.
• Unconventional fuels (e.g., from oil sands and shale) generally produce higher GHG emissions per vehicle kilometre than conventional petroleum products.

Main Views and Mitigation Strategies

8.3 Mitigation Technology Options, Practices, and Behavioural Aspects

• Energy intensity reduction can be achieved through improved vehicle performance, lightweight materials, and better freight load factors and passenger occupancy.
• Advanced propulsion systems (e.g., electric and fuel cell vehicles) offer significant potential for reducing emissions, especially in electric rail, buses, and light-duty vehicles.
• Low-carbon fuels (e.g., natural gas, biofuels, hydrogen) can reduce the carbon intensity of transport.
• Modal shift to public transport, walking, and cycling can reduce emissions and improve urban mobility.
• Behavioural change (e.g., avoiding unnecessary journeys, using ICT for logistics optimization) is a key mitigation strategy.

8.4 Infrastructure and Systemic Perspectives

• Path dependencies in infrastructure and urban form can limit or enable modal shifts.
• Integrated urban planning, transit-oriented development, and compact urban form can support lower-carbon transport.
• Urban (re)development and new infrastructure investments are critical for achieving emission reductions.

8.5 Climate Change Feedback and Interaction with Adaptation

• Accessibility and feasibility of transport routes can be affected by climate change.
• Relocation of production and reconfiguration of global supply chains may be necessary.
• Fuel combustion technologies and transport infrastructure need to be adapted to climate impacts.
• Indirect emissions from infrastructure construction, vehicle manufacturing, and fuel production are also significant.

8.6 Costs and Potentials

• Short-term mitigation is possible through efficiency improvements, fuel switching, and modal shifts.
• Long-term reductions require systemic changes, including sustainable urban planning and advanced technologies.
• Emission reductions of 15–40% by 2050 compared to baseline activity are plausible.
• Electric vehicles, hydrogen, and biofuels have potential, though their costs vary significantly.

8.7 Co-benefits, Risks, and Spillovers

• Socio-economic, environmental, and health co-benefits can arise from transport mitigation.
• Technical risks and uncertainties are present, especially with new technologies.
• Technological spillovers can enhance the effectiveness of mitigation measures across sectors.

8.8 Barriers and Opportunities

• Financial, institutional, cultural, and legal barriers hinder the adoption of low-carbon transport.
• High investment costs and slow infrastructure turnover are major challenges.
• Pricing strategies, education, and policy support can help overcome these barriers.
• Co-benefits (e.g., improved health, accessibility) can support the adoption of low-carbon transport.

8.9 Sectoral Implications of Transformation Pathways and Sustainable Development

• Transport can drive sustainable urban development by improving accessibility, safety, and time savings for the poor.
• Transformative trajectories vary by region due to differences in vehicle fleets, infrastructure, and urban development.
• Low-carbon transport can support equity, productivity, and health while reducing emissions.

8.10 Sectoral Policies

• Road transport policies include fuel economy standards and emission performance regulations.
• Rail transport benefits from investment in electrification and infrastructure.
• Waterborne transport can benefit from slow steaming and GHG mandates.
• Aviation faces challenges due to limited fuel switching options and long aircraft lifespans.
• Infrastructure and urban planning policies can reduce emissions and improve mobility.

Key Findings and Challenges

• Transport GHG emissions are expected to increase unless strongly decoupled from GDP growth.
• Decarbonizing transport is more challenging than other sectors due to high demand and slow infrastructure turnover.
• Regional differences in mitigation potential and costs are significant.
• Knowledge gaps exist in understanding the full potential of GHG reduction, especially for freight and the long-term impacts of technological changes.
• Co-benefits of low-carbon transport are substantial, but rebound effects can undermine policy effectiveness.

Conclusion

Transport is a major contributor to global GHG emissions and requires a mix of technological innovation, policy support, and behavioural change to achieve deep emission reductions. The potential for mitigation is high, especially in developing and emerging economies, where low-carbon infrastructure and modal shifts can significantly reduce emissions. However, barriers such as high costs, slow infrastructure turnover, and limited fuel options must be addressed to ensure successful decarbonization. Integrated policies and sustainable urban planning are essential for achieving long-term GHG reduction goals and promoting equitable mobility.