Designing the megacities of 2050 The number of cities with over 10 million inhabitants – known as megacities – will have doubled by 2050. Scores of new megacities will be created, mainly in Africa and Asia. This constitutes a stark environmental challenge, but also represents a real opportunity: the chance to build cities that are different and are sustainable, not only for the environment but also for inhabitants. Cities that avoid repeating the errors of the past and can offer residents better living conditions are the key to preserving social cohesion. Aerial view of Tokyo, Japan. © EyeEm 12 SAINT-GOBAIN
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