The Nigerian oil industry has had a chequered history. Whilst the income from oil has had undoubted benefits for the development of the country as a whole, there have be many cases of environmental destruction and human rights abuses. The Ogoni people have suffered the most. Oil leaks have devastated soils and waterways forcing people to leave their homes.
In June 2016, the Nigerian government announced a US$1bn scheme to restore the Ogoniland and to clear up the toxic waste left by the oil industry. It is estimated the project will take 25 to 30 years.
You can find out more by reading this article in the Guardian.