Professor Iain Stewart continues his epic exploration of how the planet has shaped human history. Iain 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 he 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?
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Ready to Watch How Earth Made Us, Season 1, Episode 5?