Perched high in the Andes are a string of high altitude villages, many of which lie over 3000 metres above sea level. Andeans have lived here for generations, but when Spanish colonists first arrived, they were unable to give birth for 53 years. The problem? A lack of oxygen.

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Earth: The Power of the Planet (2007)
Examining the great forces that shape the Earth - volcanoes, the ocean, the atmosphere and ice - the programme explores their central roles in our planet's story. How do these forces affect the Earth's landscape, its climate, and its history? CGI gives the audience a ringside seat at these great events, while the final episode brings together all the themes of the series and argues that Earth is an exceptionally rare kind of planet - giving us a special responsibility to look after our unique world.

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