Guardian: Serious allegations of human rights abuses caused by oil companies in the Niger Delta, the oil-producing region in southern Nigeria, have been published today. A 141-page report by Amnesty International quotes sources suggesting that in the last 50 years at least 9m barrels worth of oil have leaked into land and rivers in the region. Royal Dutch Shell is singled out by Amnesty as the most powerful operator in the region. The report will make uncomfortable reading for the energy …