Some key findings part of Urban Agglomarations 2009:
By the middle of 2009, the number of people living in urban areas (3.42 billion) had surpassed the number living in rural areas (3.41 billion) and since then the world has become more urban than rural. However, major disparities in the level of urbanization remain among development groups. Thus, whereas the proportion urban in the more developed regions was already nearly 53 per cent in 1950, it will still take another decade for half of the population of the less developed regions to live in urban areas (around 2020).
2. The world urban population is expected to increase by 84 per cent by 2050, from 3.4 billion in 2009 to 6.3 billion in 2050. By mid-century the world urban population will likely be the same size as the world’s total population was in 2004. Virtually all of the expected growth in the world population will be concentrated in the urban areas of the less developed regions, whose population is projected to increase from 2.5 billion in 2009 to 5.2 billion in 2050. Over the same period, the rural population of the less developed regions is expected to decline from 3.4 billion to 2.9 billion. In the more developed regions, the urban population is projected to increase modestly, from 0.9 billion in 2009 to 1.1 billion in 2050. twenty people on Earth live in megacities.