The powerful forces that made life on Earth possible in Sir David Attenborough's latest project... There is only one planet in the universe on which we know life exists. Life is only possible because of a unique balance of natural forces. The energy for living organisms is provided by the sun. A complex of atmospheric phenomena transport fresh water across the Earth. And powerful ocean currents circulate the necessary nutrients. In this series, we'll show you how these global forces work together to create the fragile system that makes life on our planet possible. One of these forces is so important that without it, life would never have begun...
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