Humanity has never been so close to destroying itself. At least that's according to nuclear scientists, according to the latest update to the Doomsday Clock. This year, the clock shows just 89 seconds ...

The Doomsday Clock now stands at 89 seconds to midnight, the closest to catastrophe in its nearly eight-decade history. Here's a look at how — and why — it's moved.

"When the clock is at midnight, that means there's been some sort of nuclear exchange or catastrophic climate change that's wiped out humanity," she said. "We never really want to get there ...

Humanity is closer to destroying itself ... on the global challenges we face including nuclear risk, climate change, biological threats and advances in disruptive technologies,” Daniel Holz ...

“When the clock is at midnight, that means there’s been some sort of nuclear exchange or catastrophic climate change that’s wiped out humanity,” she said. “We never really want to get ...

but probably without any of the modern energy-intensive technology that caused the environmental changes. This scenario is sometimes explored in post-apocalyptic fiction in which humanity has ...