"Urban transport systems based on a combination of rail lines, bus lines, bicycle pathways, and pedestrian walkways offer the best of all possible worlds in providing mobility, low-cost transportation, and a healthy urban environment." –Lester R. Brown, Plan B 4.0: Mobilizing to Save Civilization.
Press teleconference recording of Lester Brown on Plan B Update "U.S. Carbon Emissions Down 7 Percent in Four Years: Even Bigger Drops Coming." Posted November 2, 2011.