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TO GO WITH AFP STORY BY AYMERIC VINCENOT A picture taken on March 1, 2015 shows the vice-chairman of the German aid group Sign of Hope, Klaus Stieglitz, sampling salt levels in a water from a borehole in the town of Leer, the administrative center of Leer county in Unity state, South Sudan where groundwater contamination with salts and heavy metals from leaking or poorly disposed crude-oil and waste product respectively by processing plants is reaching dangerous and unprecedented levels in the county. Thick black puddles and a looted, leaking ruin are all that remain of the Thar Jath oil treatment facility, once a crucial part of South Sudan's mainstay industry. AFP PHOTO / TONY KARUMBA (Photo credit should read TONY KARUMBA/AFP/Getty Images)

TO GO WITH AFP STORY BY AYMERIC VINCENOT A picture taken on March 1, 2015 shows the vice-chairman of the German aid group Sign of Hope, Klaus Stieglitz, sampling salt levels in a water from a borehole in the town of Leer, the administrative center of Leer county in Unity state, South Sudan where groundwater contamination with salts and heavy metals from leaking or poorly disposed crude-oil and waste product respectively by processing plants is reaching dangerous and unprecedented levels in the county. Thick black puddles and a looted, leaking ruin are all that remain of the Thar Jath oil treatment facility, once a crucial part of South Sudan's mainstay industry. AFP PHOTO / TONY KARUMBA (Photo credit should read TONY KARUMBA/AFP/Getty Images)
Getty Images

AFP TONY KARUMBA