Shift to mass transit could save $100 trillion

ScienceBlog.com: "More than $100 trillion in public and private spending could be saved between now and 2050 if the world expands public transportation, walking and cycling in cities, according to a new report released by the University of California, Davis, and the Institute for Transportation and Development Policy. Additionally, reductions in carbon dioxide emissions reaching 1,700 megatons per year in 2050 could be achieved if this shift occurs."