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In this episode, Xavier Bonilla has a dialogue with Andrew Knoll about the four billion years of life on earth. They discuss geobiology, carbon and the carbon cycle, nitrogen and phosphorus, sulfur, and metals in the human body. They also talk about plate tectonics, habitability, minerals, climate change, life on other planets, and the future of life on earth.

Andrew Knoll is the Fisher Research Professor of Natural History and Earth and Planetary Sciences, Emeritus, at Harvard University. He is the recipient of the International Prize for Biology and the Crafoord Prize in Geosciences and member of the National Academy of Sciences. His books include A Brief History of Earth: Four Billion Years in Eight Chapters and Life on a Young Planet: The First Three Billion Years of Evolution on Earth, and the most recent, Earth and Life: A four billion year conversation.

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