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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
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Ozone Hole: How We Saved the Planet

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The forgotten story of the hole in the ozone layer - and how the world came together to fix it. The scientists and politicians who persuaded Ronald Reagan and Margaret Thatcher to take action reveal how the planetary problem was solved.

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