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The new documentary Countdown to Zero warns of an impending global nuclear disaster.

It says there are more that 20,000 nuclear warheads in the world and many of them went missing after the Cold War.

The documentary explains how outfits such as al-Qaeda could get their hands on a weapon of mass destruction and why Iran and North Korea could trigger a nuclear confrontation with the West.

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The only way to avoid a global tragedy, according to the film, is to eliminate nuclear weapons altogether.

On Wednesday's Riz Khan we ask: How can the world collectively deal with the threat of a nuclear disaster?

Joining the show will be the producer of Countdown to Zero, Lawrence Bender. He also produced the Oscar-winning documentary An Inconvenient Truth.

We will also have former US ambassador Thomas Pickering. He is a member of Global Zero, an international movement dedicated to the elimination of nuclear weapons worldwide.

This episode of the Riz Khan show aired from Wednesday, August 4, 2010.

Source: Al Jazeera