21.1 - Introduction
21.2 - Environmental Impacts 21.2.1 - Overview 21.2.2 - Energy consumption and climate change 21.2.2.1 - Energy consumption 21.2.2.2 - Climate change 21.2.2.3 - Outlook 21.2.3 - Conventional emissions 21.2.3.1 - Nitrogen oxides from road transport 21.2.3.2 - Other emissions from road transport 21.2.3.3 - Off-road emissions 21.2.3.4 - Aircraft emissions 21.2.3.5 - Railway emissions 21.2.3.6 - Maritime and inland waterway emissions 21.2.3.7 - Outlook 21.2.4 - Land intrusion
21.3 - Trends and Underlying Forces in the Transport System 21.3.1 - Growing transport demand 21.3.1.1 - Economic growth 21.3.1.2 - Changes in industrial structure affecting freight transport 21.3.1.3 - Socio-economic factors affecting passenger transport 21.3.2 - Changing market shares of different transport modes 21.3.2.1 - Outlook
21.4 - Outlook
21.5 - Conclusions