The Amazon, the greatest river system on Earth, amasses one-fifth of Earth’s freshwater as it flows east from the Andes to the Atlantic. Boiling streams, crystal clear lagoons, pink river dolphins and a strange new reef are some of its many secret and extreme worlds.
Discover how resistance, survival and revival are revealed through an empire of horse-mounted Comanche warriors, secret messages encoded in an Aztec manuscript and a grass bridge in the Andes that spans mountains and centuries.
In the Gamo Highlands of Ethiopia, scientists confirm the benefits of traditional stewardship even as elders witness the decline of spiritual practices that have long protected trees, meadows and mountains. Tensions with evangelical Christians over a sacred meadow erupt into a riot.