Cooper and Gupta travel to Cameroon and the Democratic Republic of Congo, where dwindling food supplies push people farther into the jungle, exposing them to mysterious and deadly diseases that scientists think could lead to the next pandemic. Ling heads to the Niger Delta, where the thirst for oil has sparked a deadly battle in Nigeria. In addition, Gupta investigates a company based in Peru that residents and health officials have accused of emitting poisonous gases into the community, and Ling reports on why one of the last remaining pockets of African elephants in Central Africa is under threat.
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