There are essentially two avenues to pursue in addressing logistic and transportation issues facing cities of the future. Build a better mousetrap - do what you do, but only better - or look for a totally different approach. Wrapping up our three-part series on urban logistics, Thomas Madrecki, director of urban logistics and mobility at UPS and Peter Harris, director of sustainability for UPS Europe talk about this balance between efficiency and self-disruption, and what it's starting to look like at UPS.