Spreading aliens, Arctic experience, and Antarctica

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...
28 September 2011
Presented by Richard Hollingham, Sue Nelson

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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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