The world must fully understand the human toll of the two atomic bombs dropped on Japan to end nuclear proliferation around the globe, the chairman of a U.N. nuclear conference said Friday.

"I think the only way to get the world free of nuclear weapons is if every citizen of this world becomes a hibakusha in the mind," Enrique Roman-Morey, the chairman of the final meeting before the 2015 Nuclear Non-Proliferation Treaty review conference, told reporters.

The Peruvian diplomat used the Japanese word to describe the A-bomb survivors.