From Scientific American:
The human race can breathe a tiny bit easier (but not too much) now that the Bulletin of the Atomic Scientists has moved the hand of its Doomsday Clock one minute farther away from midnight, the time which symbolizes catastrophic destruction and the apocalyptic end of civilization. The clock now reads six minutes from that end-of-days witching hour after it was changed during a press conference Thursday in New York City, citing an increased awareness and interest in stopping key threats to humanity (in particular nuclear conflict and global warming) since U.S. President Barack Obama took office about a year ago.
But the Bulletin, a group established shortly after World War II by the likes of Albert Einstein and J. Robert Oppenheimer, tempered its actions with the major caveat that humankind could slip closer to oblivion again if the world's governments do not follow through on promises made to curb the creation of more nuclear weapons and greenhouse gases. Although the Bulletin was originally formed out of concern for global nuclear annihilation, the group has since broadened its purview to include the world's vulnerability to climate change. The Bulletin's members at Thursday's press conference noted that leaders of nations equipped with nuclear weapons have expressed the desire to cooperate in reducing their arsenals and securing nuclear bomb-making material. This includes a shared sentiment between Obama and Russia's President Dmitry Medvedev that nuclear arms negotiations that could bring down deployed strategic warheads from more than 2,000 to about 1,500 each.