IT WAS ONLY THREE DECADES AGO that Pittsburgh was deemed to be dying – an urban nightmare with polluted rivers, crumbling inner core, steadily declining employment, and a population fleeing for greener pastures. Yet the city my wife and I visited this past weekend showed rare traces of such a blighted past. Instead, we were caught up in a city life teeming with creativity, investment, and a keen new belief in itself. In just few years it has transformed from a warning to a model. We had first been invited down by officials this past summer for the 15th anniversary of their RiverLife project. Rarely had we witnessed a waterfront so teeming with possibilities. Even though this past weekend’s visit was in the midst of…