Nigeria: The Cost of Oil - In Focus - The Atlantic “A view of an illegal oil refinery is seen in Ogoniland outside Port Harcourt in Nigeria’s Delta region March 24, 2011…(Reuters/Akintunde Akinleye)”
That black stuff is oil.
"Nigeria is the world’s 8th largest producer of crude oil, yet remains one of its poorest nations — an estimated 70 percent of its 150 million residents live below the poverty line. The environment is paying a steep price as well. An estimated 500 million gallons of oil have spilled into the delta — the equivalent of roughly one Exxon Valdez disaster per year."