"I find hope in the work of long-established groups such as the Arms Control Association...[and] I find hope in younger anti-nuclear activists and the movement around the world to formally ban the bomb."
Clarification
The April 2013 news story “Amano Reports No Progress in Iran” said that according to the International Atomic Energy Agency (IAEA), about 250 kilograms of 20 percent-enriched uranium, when further enriched to weapons grade, is enough to make one nuclear weapon. That figure has appeared in published articles and was confirmed as accurate by an IAEA staff member, but the IAEA has not made such an estimate in an official document or statement.