Scientists and global leaders revealed on Tuesday that the "Doomsday Clock" has been reset to the closest humanity has ever come to self-annihilation.

The Bulletin of the Atomic Scientists set the clock to 89 seconds before midnight - the theoretical point of annihilation. That is one second closer than it was set last year. The

The Doomsday Clock has been moved to 89 seconds to midnight - the closest it has ever been to the end of the world - but some people have taken issue with the symbolic gesture

"This is a bleak picture. But it is not yet irreversible."

The symbolic clock is set at 89 seconds to midnight, with nuclear threats, AI misuses and climate change being the key factors.