Today nine nations collectively control more than 15,000 nuclear weapons, each hundreds of times more powerful than those dropped on Hiroshima and Nagasaki. We don't need more nuclear weapons; we need a new generation to face the unfinished challenge of disarmament started decades ago. Nuclear reformer Erika Gregory calls on today's rising leaders — those born in a time without Cold War fears and duck and cover training — to pursue an ambitious goal: ridding the world of nuclear weapons by 2045.

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