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This study examines how changes in transport infrastructure and transit system investments would affect urban passenger transport emissions as well as mobility by different income groups.

While a number of studies have focused on the effects on global warming pollution of more stringent standards for motor vehicle fuel economy, emissions of local air pollutants, and alternative fuels, this is the first study to examine major changes from a transport infrastructure and transit system investments world-wide perspective.

The findings of the study are relevant to three concurrent policy discussions by world leaders:

  • how to manage climate change,
  • how to advance equitable and environmentally sustainable economic and social development, and
  • how to manage unprecedented urbanization.

To make progress, the world needs to find ways to do all these things together. This report shows a way to do so.

The study, first released on the September 17, 2014 United Nations (UN) preparatory meeting for Habitat III, and discussed at events connected to the UN Secretary General’s Climate Summit on September 23, 2014, contributes to concurrent discussions of Sustainable Development Goals (SDGs) recommended to the UN General Assembly. This includes an SDG focused on sustainable cities and human settlements with a key target for sustainable transportation.

Product Type
Knowledge & Learning
Focus Area
Low Carbon Development
Scope / Extension
Sub-national, Project, & Local/Community level
Urban (special case)
Methodological Steps
Spatial / Geographical Coverage Location
Current Version
System Requirements
e-Learning available
Facilitated Learning Avalable