'When the shamans stop dancing and life in the rainforest loses its balance, the sky will fall down and crush everything.' That wisdom is passed on from generation to generation by the Yanomami in Brazil. But prospectors are polluting the rivers, the shamans are dying, the rainforest is disappearing and the earth is warming. Chieftain Davi Kopenawa and his son Dario are traveling the world, fighting an international battle to defend their land against invaders. They warn Westerners that when the sky falls, they will be crushed too. Why don't they listen?