Human futures are urban futures. During the last decade, the number of people living in cities exceeded the number living in rural areas for the first time in human history (Ash et al 2008). For the foreseeable future, most human lives will be urban lives. Yet, if anything, these figures underestimate the influence of the global urban transition on humanity and the planet. While urban areas occupy just 3% of land surface, they are responsible for perhaps three-quarters of carbon emissions and natural resource utilization (UNEP 2012b).
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