Grasslands: Roots of Power

17th February 2011 48 mins Season 1 Episode 6

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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Season 1 · Episode 7

Rivers: Friend and Foe

Rivers provide the essentials of life: fresh food and fresh water. They act as natural highways and enable humans to live in just about every environment on Earth. Rivers are not to be taken for granted, however, as they freeze, flood, and sometimes dry up - disappearing entirely!

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