Half of humanity â €“ 3.5 billion people â€“ lives in cities today and 5 billion people are projected to live in cities by 2030. The worldâ€™s cities occupy just 3 percent of the Earthâ€ ™s land, but account for 60-80 percent of energy consump-tion and 75 percent of carbon emissions. Rapid urbanization is exerting pressure on fresh water supplies, sewage, the living environment, and public health.
95 percent of urban expansion in the next decades will take place in developing world 90 percent of urban growth is forecasted to happen in Asia and Africa in the next 30 years.
828 million people live in slums today and most of them are found in Eastern and South-Eastern Asia.
By 2050 70 per cent of the world population is predicted to live in urban settlements.