Pakistan s two major cities of Karachi and Lahore are expected to be placed in world s mega cities category by 2025, according to a UN report. It predicts that half of the world s 6.7 billion people are expected to live in urban areas by the end of this year. The report, entitled 2007 Revision of World Urbanisation Prospects , provides the official UN estimates and projections of the urban, rural and city populations of all countries in the world up to 2050. The number of mega cities those with more than 10 million inhabitants which today accounted for about 9 per cent of the world s urban population would increase to 27 by 2025. They would likely absorb only 12 per cent of the world s urban population growth. Smaller cities were likely to grow more quickly.
