What fuelled life on Earth some 4,000 billion years ago? From the billions of organisms that live in the toxic chemicals of volcanic springs to the super-hot hydro-thermal vents deep in the oceans, Dr Iain Stewart investigates in the ground-breaking and award-winning BBC series Earth: The Power of the Planet. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here: http://www.youtube.com/bbcearth
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