city that henry ford built on iraq it was great it was the city of mass production that raised this out of poverty lifted welfare across the globe. but over time there's this quote from will rogers henry ford which says it'll take one hundred years to tell whether you helped or hurt us but you certainly didn't leave us in the same place what we've seen is this same general purpose technology of the combustion engine which changed people's lives changed the cities we lived in has start to come up with some problems ok before we go on let me just explain that one of the themes here is that what we're finding in the twenty first century is that all these models economic models are hitting against something called what's called capacity constraints of planet earth platter as a virus and as a certain ability to sustain growth as that's defined and it has different definitions and so some economies are aware of this some are not you're trying to offer some way through the thicket of this. move all for sitting in a little ball object or unstoppable force or this will be less actually worse than that but it's better that there's a triple set of problems not just the carrying capacity of