Transport-related emissions are growing worldwide and transport currently accounts for about 28 per cent of total end-use energy. Greenhouse gas (GHG) emissions from the transport sector have more than doubled since 1970, and have increased at a faster rate than any other energy end-use sector to reach 7.0 gigatonnes of carbon dioxide equivalent (Gt CO2 eq) in 2010.
The Intergovernmental Panel on Climate Change has found that without mitigation actions, transport emissions could increase at a faster rate than emissions from the other energy end-use sectors and reach around 12 Gt CO2 eq/year by 2050 (Sims et al., 2014).
The methodologies presented in this compendium were chosen to cover a broad range of different mitigation action types in terms of scale, type of intervention and affected modes focussing on interventions with significant mitigation potential. The selection was based on the Partnership on Sustainable Low Carbon Transport review of transport methodologies and tools, categorised by type of mitigation action. The mitigation actions are loosely grouped based on their geographic scale, mechanism within an 'activity, share, intensity, fuel' (ASIF) model and the affected modes as outlined above. The remainder part of the document starts with an overview of approaches on GHG quantification in the transport sector, followed by a reader guide to the mitigation action sections