Mountains: Life in Thin Air

10th February 2011 49 mins Season 1 Episode 5

From lush cloud forests to bare summits, many people make their homes in the extreme altitudes of the world's mountain ranges. Explore the extraordinary ways life is sustained in this world of thin air and few resources.

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Season 1 · Episode 6

Grasslands: Roots of Power

Grasslands feed the world. Over thousands of years, humans have learned to grow grains on the grasslands and domesticate the creatures that live there, propelling our population to almost seven billion people in the process.

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