Oceans under greatest threat in history, warns Sir David Attenborough

Blue Planet 2 producers say final episode lays bare shocking damage humanity is wreaking in the seas, from climate change to plastic pollution to noise

The world's oceans are under the greatest threat in history, according to Sir David Attenborough. The seas are a vital part of the global ecosystem, leaving the future of all life on Earth dependent on humanity's actions, he says.

Attenborough will issue the warning in the final episode of the Blue Planet 2 series, which details the damage being wreaked in seas around the globe by climate change, plastic pollution, overfishing and even noise.