Steve Connor reports from a project workshop with Gothenburg, Cape Town, Kisumu and Greater Manchester, sharing their insights on how sustainability is governed and delivered in their respective cities. Over half of humanity now lives in cities and the ratio between bumpkins and townies continues to climb in favour of those who choose an urban life; one recent UN estimate suggested that by the end of the century 80% of us will have made cities our home. For sustainability wonks this means that the sustainable development challenge is intractably linked to how we grow, govern and design our...