The Guardian reports: The world tiptoed closer to the apocalypse on Tuesday as scientists moved the Doomsday Clock one minute closer to the zero hour.

The symbolic clock now stands at five minutes to midnight, the scientists said, because of a collective failure to stop the spread of nuclear weapons, act on climate change, or find safe and sustainable sources of energy – as exemplified by the Fukushima nuclear disaster.

The rare bright points the scientists noted were the Arab spring and movement in Russia for greater democracy.

The clock, maintained by the Bulletin of Atomic Scientists, has been gauging our proximity to global disaster since 1947, using the potent image of a clock counting down the minutes to destruction. Until Tuesday afternoon, the clock had been set at six minutes to midnight.

“It is five minutes to midnight,” the scientists said. “Two years ago it appeared that world leaders might address the truly global threats we face. In many cases, that trend has not continued or been reversed.”