Nairobi, whose Kibera slum is pictured here, is growing at four per cent a year — faster than Houston, Cairo, Sào Paulo and Mexico City. (Photo: Schreibkraft)

Nairobi, whose Kibera slum is pictured here, is growing at four per cent a year — faster than Houston, Cairo, Sào Paulo and Mexico City. (Photo: Schreibkraft)

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Nairobi, whose Kibera slum is pictured here, is growing at four per cent a year — faster than Houston, Cairo, Sào Paulo and Mexico City. (Photo: Schreibkraft)

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