I&#x27;m not sure why you&#x27;d say that cities are unsustainable. All the folks who research this stuff seem to agree that urban living is more sustainable; urbanites tend to use less resources every way you cut it. They drive less, their houses are smaller, their houses leak less energy because they typically have fewer surfaces exposed to the outside environment, they can rely more on common infrastructure for moving resources around instead of having to have everything moved around by truck, etc etc.<p>I&#x27;m also not convinced you can really blame urbanites for the fear of terrorism. Cities might be the preferred target for terrorist attacks, but at least in the USA people it&#x27;s rural folks who tend to be more worried about terrorism while urbanites tend to take a more balanced view of the subject.