NIGERIA needs $12 billion to clean up decades-old oil spills in southern Bayelsa state over a 12-year period, a new report said and singled out Shell and Eni for being responsible for most of the pollution. Bayelsa is one of the major oil-producing states in the Niger Delta, a region blighted by pollution, conflict and corruption related to the oil and gas industry. Oil majors in Nigeria have long faced legal challenges over Niger Delta spills, which they mostly blame on sabotage and vandalism of pipelines and illegal refining. The Bayelsa State Oil and Environmental Commission said in a report that it…