"City leaders aspiring to transform their cities into models of sustainability must look beyond city limits and include in their calculation the global flow of goods and materials into their realm, argue researchers in the Royal Swedish Academy of Sciences journal Ambio." (Source: IGBP.net)

Interesting analysis: if we look at the total footprint of cities, how sustainable are they really? Is urbanisation really the key to future sustainability?

And what about the social sustainability of cities in a world of increasing inequality?