| Summary/Abstract |
The present century is known as urban century. In the last century alone, the world's urban population has grown from 220 million to almost three billion. Half of humanity, 3.5 billion people, currently lives in cities and by 2055 an estimated 75 per cent of the world’s population will live in urban areas. Cities occupy just 2 per cent of the Earth’s land, but account for over 70 per cent of both energy consumption and carbon emissions. Today, one out of two humans already lives in an urban environment.
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