Some years the time changes, and some years it doesn’t. The Doomsday Clock is set every year by experts ... The clock has been an effective wake-up call when it comes to reminding people about ...

some nation might end up using nuclear weapons, and that’s terrifying.” Starting in 1947, the advocacy group used a clock to symbolize the potential and even likelihood of people doing ...

Sign up for CNN’s Life, But Greener newsletter. Our limited newsletter series guides you on how to minimize your personal role in the climate crisis — and reduce ...

Over the last 78 years, the clock’s time has changed according to how close scientists believe the human race is to total destruction. Some years the time changes, and some years it doesn’t. The ...