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The Nigerian government has launched an unprecedented $1bn (£750m) operation to clean up the environmental damage caused by the oil industry, and it will be paid for by the polluters. But will it work? The BBC’s Stephanie Hegarty reports…

The scenario playing out in five communities in Ogun State in the last few weeks could best be described as a war situation. The situation is better imagined than experienced as there is no life in areas under the siege of militants who…