Sing along with Vera Lynn: We'll meet again, don't know where, don't know when...

Harvard psychologist Steven Pinker thinks the world is becoming less violent, but scientists believe we’ve taken a step back in our efforts to avert nuclear catastrophe:

It is five minutes to midnight. Two years ago, it appeared that world leaders might address the truly global threats that we face. In many cases, that trend has not continued or been reversed. For that reason, the Bulletin of the Atomic Scientists is moving the clock hand one minute closer to midnight, back to its time in 2007.

Despite the promise of a new spirit of international cooperation, and reductions in tensions between the United States and Russia, the Science and Security Board believes that the path toward a world free of nuclear weapons is not at all clear, and leadership is failing. The ratification in December 2010 of the New START treaty between Russia and the United States reversed the previous drift in US-Russia nuclear relations. However, failure to act on the Comprehensive Test Ban Treaty by leaders in the United States, China, Iran, India, Pakistan, Egypt, Israel, and North Korea and on a treaty to cut off production of nuclear weapons material continues to leave the world at risk from continued development of nuclear weapons. The world still has approximately 19,500 nuclear weapons, enough power to destroy the Earth’s inhabitants several times over. The Nuclear Security Summit of 2010 shone a spotlight on securing all nuclear fissile material, but few actions have been taken. The result is that it is still possible for radical groups to acquire and use highly enriched uranium and plutonium to wreak havoc in nuclear attacks…