And today marks the 20th anniversary of the execution of Nigerian activist Ken Saro-Wiwa. Saro-Wiwa led the movement against Shell’s oil practices in the Ogoni region. Oil pipelines crisscrossed Ogoni land, and gas flares the size of apartment buildings lit up the night sky. Despite widespread international protests, Saro-Wiwa was hanged under the Nigerian dictatorship after a sham trial along with eight other Ogoni rights activists. The anniversary of Saro-Wiwa’s death comes as Amnesty International says areas of the Niger Delta remain heavily polluted by oil spills, years after Shell claims to have cleaned them up.