The symbolic countdown to humanity’s end remained stuck at three minutes to the brink of the apocalypse for a second year in a row on TuesdayThe Doomsday Clock, the symbolic countdown to humanity’s end, remained stuck on the brink of the apocalypse for a second year on Tuesday, because of the continued existential threats posed by nuclear war and climate change.The Bulletin of the Atomic Scientists, the group which created the clock in 1947, said it was keeping the clock hands set at three minutes to midnight – the closest the clock has come to destruction since the throes of the cold war in 1984.