Former Berkshire Hathaway CEO Warren Buffett said on Tuesday that the global nuclear threat would be more dangerous if Iran were to obtain a nuclear weapon. Buffett said during a CNBC interview that nuclear weapons remain the key global risk, adding that while several countries already possess them, “it would be more difficult if Iran has the bomb than if they don’t.” He warned that “one way or another” nuclear weapons could be used over time, citing risks tied to the unstable actors gaining control. Buffett also referenced historical nuclear tensions, saying the world has faced “a lot of close calls,” and he warned that the risk increases if “someone who gets their hands on the switch is dying.”