Spreading aliens, Arctic experience, and Antarctica

28 September 2011
Presented by Richard Hollingham, Sue Nelson


This week in the Planet Earth Podcast, how hikers and walkers could be unwittingly changing the landscape by spreading alien species; what it's like to work as a marine biologist in the Arctic in temperatures of minus 40Ã?,Ã?,°C; and exactly how stable is the West Antarctic Ice Sheet?


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