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.

From the Royal Cordillera to the Atacama Desert, Mathieu's high-altitude journey explores earth's origins and analyzes climate change impacts.