Africa's cities to triple in size

The number of people living in African cities will triple over the next 40 years and by 2050 60% of Africans will be city dwellers, a UN report has said.

In five years Lagos in Nigeria is set to overtake the Egyptian capital Cairo as Africa's biggest city.
UN-Habitat's Joan Clos said Africa needed to invest urgently in housing.
He told the BBC that sub-Saharan Africa could learn from North Africa as Egypt, Libya, Morocco and Tunisia had almost halved slum areas in the past 20 years.
Some 199.5 million people in sub-Saharan Africa live in slums, the highest number in the world, the UN said earlier this year.
According to UN-Habitat's State of African Cities 2010 report, urbanisation is happening faster in Africa than anywhere else in the world.