Global shift away from cars would save US$100 trillion, eliminate 1,700 MT of CO2 pollution
http://www.sciencedaily.com/releases/2014/09/140917073300.htm

More than $100 trillion in cumulative public and private spending, and 1,700 megatons of annual carbon dioxide -- a 40 percent reduction of urban passenger transport emissions -- could be eliminated by 2050 if the world expands public transportation, walking and cycling in cities, according to a new report.