The IPCC Working Group III assesses all relevant options for mitigating climate change through limiting or preventing greenhouse gas emissions and enhancing activities that remove them from the atmosphere.
The WGIII contribution to the IPCC Fifth Assessment Report "Mitigation of Climate Change" has been accepted by governments and published online in April 2014. See mitigation2014.org
Different item are considered in 2014 mitigation plan. More than chapter 8 – Transport, Chapter 12 – Human Settlements, Infrastructure and Spatial Planning contains interesting remarks about Density, connectivity and accessibility.