Ziemia, planeta roślin Odcinek 3: The Challenger

Presenter Iain Stewart discovers the remarkable impact of just one plant: grass. On the savannah of South Africa he sees how grass unleashed a firestorm to fight their greatest enemy, the forests. He shows how cutting your finger on a blade of grass shows us how they transformed life in the oceans. In Senegal he meets the cleverest chimps in the world. And in the ruins of the oldest temple on Earth he tells the extraordinary story of how grass triggered human civilisation.