|23:53||-2||Little progress on global nuclear disarmament; United States rejects a series of arms control treaties and announces its intentions to withdraw from the Anti-Ballistic Missile Treaty; concerns about the possibility of a nuclear terrorist attack due to the amount of weapon-grade nuclear materials that are unsecured and unaccounted for worldwide.|
|2007||5||23:55||-2||North Korea tests a nuclear weapon in October 2006, Iran's nuclear ambitions, a renewed American emphasis on the military utility of nuclear weapons, the failure to adequately secure nuclear materials, and the continued presence of some 26,000 nuclear weapons in the United States and Russia. After assessing the dangers posed to civilization, climate change was added to the prospect of nuclear annihilation as the greatest threats to humankind.|
|2010||6||23:54||+1||Worldwide cooperation to reduce nuclear arsenals and limit effect of climate change. New START agreement is ratified by both the United States and Russia and more negotiations for further reductions in the American and Russian nuclear arsenal are already planned. 2009 United Nations Climate Change Conference in Copenhagen, Denmark results in the developing and industrialized countries agreeing to take responsibility for carbon emissions and to limit global temperature rise to 2 degrees Celsius.|
|2012||5||23:55||-1||Lack of global political action to address global climate change, nuclear weapons stockpiles, the potential for regional nuclear conflict, and nuclear power safety.|
|2015||3||23:57||-2||Continued lack of global political action to address global climate change, the modernization of nuclear weapons in the United States and Russia, and the problem of nuclear waste.|
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