Structural Vulnerabilities of a Changing Global Urban System. Urban areas are increasingly linked to one another through flows of people, goods, information, and finance. Local crises can generate network-scale impacts that spread across these linkages, as illustrated by the global economic effects of the T_hoku Tsunami and Hurricane Katrina. Despite recent observations of hazards spreading across societal linkages, little attention has been given to the possibilities for climate change impacts to generate similar systemic impacts. This research couples graph theory with urban science to understand systemic properties of urbanization and fragilities to climate impacts to provide new perspective on climate-society interactions. In this work, I estimated the quantity of industrial production flows between 1,686 urban areas for each year between 1990 and 2012. I found that smaller urban areas are playing an increasingly important role in articulating the network, both because they are rapidly growing and because they have increasingly global positions in the network. The positions of the largest urban areas shifted toward roles as local connectors from previously held roles as global connectors. The relative quantity of production shifted from urban areas in Western Europe and North America toward East Asia and Eastern Europe. These statistical and geographic shifts indicate a more evenly connected network in which random failures are more likely to generate systemic impacts than the failures of the largest urban areas.