"Urbanization is the defining global phenomenon of this century. For the first time in history, more than half the world’s population lives in urban areas. Between 2000 and 2030, in developing countries, the urban population is expected to double, and entire built-up areas are projected to triple if current trends continue. This rapid demographic and spatial transformation may prove to be difficult for cities in developing countries, especially small- and medium-sized cities, where capacity is typically inadequate to cope with major urban challenges. These challenges include climate change, resource scarcity, slum growth and increased poverty, and safety and security concerns." 

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