Earth follows three animal families — polar bears scavenging for food in the High Arctic; elephants trekking across the Kalahari Desert in search of water; a humpback whale and her young calf on their annual 4,000-mile migration — as they struggle to survive the unrelenting harshness of their disparate climates, a task made all the more difficult by a dangerously warming planet. State-of-the-art camera equipment captures images of startling clarity and proximity.

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