The start of the article:
For the first time in history, announced researchers this May, a majority of the world’s population is living in urban environments. Cities—efficient hubs connecting international flows of people, energy, communications, and capital—are thriving in our global economy as never before. However, the same factors that make cities hubs of globalization also make them vulnerable to small-group terror and violence.
The conclusion:
Our choice is simple: we can rely exclusively on our current security systems to stop the threats—and suffer the consequences when they don’t—or we can take measures to mitigate the impact of these threats by exerting local control over essential services.