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Early African dairy farming, seabird migrations - Planet Earth Podcast - 12.07.31

Early African dairy farming, seabird migrations - Planet Earth Podcast - 12.07.31
Update: 2012-07-31
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This week in the Planet Earth Podcast: how dairy farming in Africa 7000 years ago led to the speedy evolution of the gene that lets us digest milk; and how climate change could be having a detrimental effect on seabirds and fish in the Southern Ocean.
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