““The fact that there are only nine nuclear-armed nations today — and not 15, or 20, or 50 — represents the Cold War’s one clear legacy of hope. But that communal restraint presumes an ongoing and universal commitment to disarm, even if in stages, over time. Obama’s vision of a nuke-free world, articulated so passionately in Prague in 2009, was not a fanciful dream, but a hard-headed description of the one and only acceptable future that lies ahead of the human species. Here, coming from multiple fronts, is this summer’s warning: One way or another, the next nuclear age will be the last.””