http://thebulletin.org/three-minutes-and-counting7938
The Bulletin of Atomic Scientists have moved the Doomsday Clock up 2 minutes to 3 minutes to midnight from what they see as failure of nation's leaders to address several issues, including climate change, proper disposal of waste from and proper upkeep of nuclear energy sites, lack disarmament of nuclear weapons, and technological threats, and the lack of time to face and solve these issues.
This is not the closest the clock has gone to midnight. That was back in 1953 when the U.S. and the Soviet Union tested thermonuclear weapons within nine months of each other.
More info on the clock from Wikipedia, in the following link.
http://en.wikipedia.org/wiki/Doomsday_Clock