I Walked on Earth

In Gabon's forests, Mathieu follows a vet saving gorillas and tracks viruses from apes to humans. In Franceville, scientists study SIV in mandrills.

New Caledonia's fragile coral reef houses 15,000 species but faces pollution threats. Pharmacologists seek a cure.

In Peru, Mathieu explores from the Andes to the Amazon and learns natural healing methods in the high-altitude Altiplano.

Mathieu visits Indonesia's 17,000 islands and its 400 active volcanoes, violent earthquakes and tsunamis—all part of the Ring of Fire.

Sabrina Krief studies chimpanzees' self-healing plant selection in Uganda to find cures for common illnesses in the face of imminent extinction.

In the Everglades, scientists study alligators and collect snake venom for antidotes. Manatees, endangered by boat propellers, are rehabilitated.

In Zimbabwe, French scientists study the relationships between elephants, herbivores and predators.

Mathieu travels to Costa Rica's rich biodiversity, starting on San Miguel's Pacific beaches studying endangered sea turtles and conservation efforts.

In India, the world's soon-to-be most populated country, Mathieu meets scientists balancing nature conservation with demographic growth.