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Episode 5: The Calling

The Calling

Season 4 Episode 5
53:05
When Whales Could Walk

When Whales Could Walk

Season 51 Episode 1
53:31
Angry Planet

Melting Siberia

On his first-ever expedition to Siberia, George witnesses the alarming effect of melting permafrost, visits a 12,000-year-old dog, and camps out with reindeer herders on the chilliest night of his life.

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