As the world sees the biggest wave of urban growth in history, with millions of people flocking to the fast-growing cities of the developing world, cities are coming under the spotlight as never before. In 2014, the United Nations launched Oct. 31 as World Cities Day to promote awareness of global urbanization and highlight the need for cooperation to meet the challenges of growth.
Around 54 percent of the world population currently live in urban areas which is forecast to rise to 66 percent by 2050. The urban population rose to 3.9 billion in 2014 from 746 million in 1950, according to the United Nations.
Cities may be home to growing numbers of people, but cover less than 1 percent of the world’s surface. There are now 28 mega-cities – with populations of 10 million plus – compared to just 10 mega-cities in 1990