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.

• Early African dairy farming, seabird migrations - Naked Scientists Science Podcasts and Science Radio Shows
• Wet But Not Wild - Farming Fish - Podcasts
• Making a Meal out of Microbes - Podcasts
• Pre-Historic Dairy Cows - Planet Earth Online - Interviews
• Pandemic! - Where do new viral infections come from? - Features
• Life Where the Sun Don't Shine... - Podcasts