"Seventy-one years ago tomorrow, the city of Hiroshima was leveled by an awesome and gruesome new weapon: the atomic bomb. Three days later, Nagasaki faced the same fate. Today, the world has entered a new and potentially more dangerous era of nuclear risks.
Consider this: There are now nine nuclear-armed countries with arsenals that could destroy our way of life; bomb-making material is spread across 24 countries, much of it poorly secured; and there are thousands of radiological sources worldwide that could be stolen by terrorists and used to build dirty bombs.
Meanwhile, tensions between the United States and Russia, which hold the vast majority of the world's nuclear weapons, are growing -- and a costly and destabilizing new arms race is underway.
Against this challenging backdrop, we cannot allow ourselves or our leaders to be complacent about the need to address today's risks."