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Legendary oceanographer Sylvia Earle and a cast of pioneering marine scientists tell the story of the incredible work being undertaken across the planet to protect the fragile ecosystem of our oceans. Perpetual Planet: Heroes of the Oceans is a showcase of the wonder of the sea, of the living laboratory we all live in and of the vital science being carried out beneath the waves...。We take our liberties for granted. They seem absolute and untouchable. But they are the result of a series of violent struggles fought over 800 years that, at times, have threatened to tear our society apart. On the frontline was a document originally inked on animal skin – Magna Carta. Distinguished constitutional historian David Starkey looks at the origins of the Great Chart...。