Nigeria's Ogoniland region could take 30 years to fully recover from oil spills, a UN report says. The long-awaited UN study says environment restoration could prove to be the world's "most wide-ranging and long-term oil clean-up" ever taken.
The report found that pollution seriously threatened public health in at least 10 communities in the region. Oil giant Shell has accepted liability for two spills which devastated communities in 2008 and 2009.