Most likely there has been toxic waste dumped in many African countries. A law-suit in Europe regarding toxic wasted dumped in the Ivory Coast by a Dutch company is underway.
correction Trafigura is a Swiss Company. I am not sure why this is being tried in the U.K. I think it's because this court said they would take the case.
...waste that was illegally tipped on Ivory Coast's biggest city, Abidjan. A giant multinational is being sued in London's High Court by thousands of Africans who claim they were injured as a result.
BBC has an article and videos