IRIN: Several large African cities are at risk from rising sea levels and intense storms, experts warn. Poor neighbourhoods and slums in Bugama and Okrika in Nigeria, Freetown in Sierra Leone, Bathurst in the Gambia and Tanga in Tanzania, are especially vulnerable. In such low-income urban centres, infrastructure is often non-existent or ill-maintained, according to a World Bank report, Sea level Rise and Storm Surges, while storm-water drainage infrastructure is often outdated and …