Watch part two
Can you imagine a world without fish?
That is the question being asked by a hard-hitting documentary called The End of the Line.
The film explains the catastrophic consequences of over fishing - and looks at the many important warning signs from the ocean that we have been ignoring.
The United Nation's Food and Agriculture Organisation says that around 80 per cent of wild marine fish are now either fully exploited or over fished.
The agency says the most popular varieties are at risk of extinction within a few decades.
Fishing quotas are often ignored completely, and in some parts of the world the ocean's stocks are totally depleted.
So who is to blame? Is it the fish industry or the demanding consumers?
On Thursday, Riz speaks to Charles Clover, the award-winning author and director of the film.
In his work, Clover focuses on environmental issues and previously co-authored a book on organic agriculture with HRH Prince Charles, The Prince of Wales.
He first published The End of the Line in 2004.
Rupert Murray turned the book into a feature-length documentary, which premiered at the Sundance Film Festival earlier this year.
This episode of the Riz Khan show aired from Thursday, June 25, 2009.