Scientists have outlined the reasons why they believe the world is one second closer to annihilation.  

The Doomsday Clock has been unveiled for the first time this year and showed we're nearer to a world-ending catastrophe than ever before.

The Bulletin of Atomic Scientists, which decides where the hands are set, moved the timer to 89 seconds to midnight, one second closer than last year - the closest it has ever been in its 78-year history.