At a private reserve in Costa Rica, scientists use photoidentification to study the movements of the endangered jaguars. The forests of Central America grapple with the invasion of a microscopic fungus that can kill all frogs in its path in just a few months.

A crew of mariners, scientists and filmmakers are followed as they cast off on the Sedna IV, an oceanographic schooner, to sail around the world exploring the beauty of nature, how ecosystems work and conservation challenges facing the planet.

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