Prince William will urge world leaders to “think big” on their actions to protect our seas as legendary broadcaster Sir David Attenborough warned about the consequences of destroying the “great treasure” that is the world’s oceans.

They were speaking ahead of World Oceans Day on Sunday, when the Prince will tell a UN conference in the south of France that we should act with urgency, and Sir David releases his new film about the harm we are doing to our oceans.

Ahead of World Oceans Day, a video of a conversation between the heir to the throne and Sir David has been released in which the renowned conservationist speaks about his horror that so much damage is being done to the marine environment because it is largely “hidden” from view.

Despite filming many hundreds of hours of wildlife p

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