Special Editions

Planet Earth episode

Tue, 27th Sep 2011

Spreading aliens, Arctic experience, and Antarctica

The blue ice covering Lake Fryxell, in the Transantarctic Mountains (c) Joe Mastroianni, National Science Foundation

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 40C; and exactly how stable is the West Antarctic Ice Sheet?

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