Added: 25-09-2011 19:49:57

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Series in which Professor Iain Stewart looks at how four geological forces have shaped human history. He explores the most recently established force, humans. It's easy to think of the human impact on the planet as a negative one, but as Iain discovers, this isn't always the case. It is clear that humans have unprecedented control over many of the planet's geological cycles; the question is, how will the human race use this power?

Tags: BBC Earth Human

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