Why the U.N. chief says we are 'one miscalculation away from nuclear annihilation'

U.N. Secretary-General António Guterres says we are facing "a time of nuclear danger not seen since the height of the Cold War." His remarks came at the 2022 Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons at the United Nations in New York City. (Ed Jones/AFP via Getty Images)

The world is now enduring greater stress than any time in recent decades, according to U.N. Secretary-General António Guterres. And while humanity has so far avoided "the suicidal mistake of nuclear conflict," he said, tensions are hitting new highs at a time when many lessons of the past seem forgotten.

"Today, humanity is just one misunderstanding, one miscalculation away from nuclear annihilation," the world's top diplomat said at a U.N. conference on the non-proliferation of nuclear weapons in New York City.