In Nigeria, the oil giant Shell is being accused of covering up devastating oil spills by blaming them on sabotage by local militants in the Niger Delta. Amnesty International says Shell has exploited Nigeria’s political instability and lack of oversight to evade its responsibility for spills caused by its own faulty equipment. An estimated 13 million barrels of oil have been spilled in the Niger Delta, equivalent to an Exxon Valdez disaster every year for forty years.