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Water World
Dr Helen Czerski explains why the ocean is so vital to life on earth and what we need to know to be good citizens of our ocean planet.
![](https://image.tmdb.org/t/p/w300/s4vlHqP5efHYh3nOFfOfTKclY1L.jpg)
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Other episodes for this season
![Engine Earth](https://image.tmdb.org/t/p/w300/hhWbTh9vUTdeciEEDVMjr9HBVeb.jpg)
![Water World](https://image.tmdb.org/t/p/w300/hhWbTh9vUTdeciEEDVMjr9HBVeb.jpg)
![Up In The Air](https://image.tmdb.org/t/p/w300/hhWbTh9vUTdeciEEDVMjr9HBVeb.jpg)
Dr Helen Czerski explains why the ocean is so vital to life on earth and what we need to know to be good citizens of our ocean planet.