A science-oriented advocacy group moved its “Doomsday Clock” to 85 seconds to midnight, saying the Earth is closer than ever to destruction. The Bulletin of Atomic Scientists on Tuesday cited threats from nuclear war, climate change, potential misuse of biotechnology and artificial intelligence. Last year, the clock advanced to 89 seconds to midnight. Since then, “global understandings are collapsing, accelerating a winner-takes-all great power competition and undermining the international cooperation” needed to reduce risks, the group said. The advocacy group began using a clock in 1947 to symbolize the potential and likelihood of people doing something to end humanity.