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C'est pas sorcier delves into the heart of the largest tropical forest on the planet: the Amazon rainforest. This forest covers a third of the South American continent, roughly the size of the United States! With several million species, the fauna and flora there constitute an exceptional world heritage. Fred, Jamy and Sabine went to meet CNRS scientists who work in the middle of Guyana, in a primary forest that has never been influenced by man. We discover with them the unsuspected treasures of this extraordinary biodiversity. How does the climate influence the forest? Why do trees develop their roots very far above ground? What are the different layers of a tropical forest? Is it fair to say that the Amazon rainforest is the lungs of our planet? And if, as is often said, it is a carbon trap that can limit global warming, should we stop exploiting it?