In 1947, the Bulletin of the Atomic Scientists created the “Doomsday Clock” to show how close humans were to destroying civilization. On the clock, midnight represented a global catastrophe to end civilization.

At that time, the Bulletin set the clock to 11:53 p.m. because of the threat of nuclear war. Since then, the time is adjusted each year to reflect world events.

This year, the clock was moved to 11:57 p.m., making it the closest to destruction since 1984 (due to the Cold War).

So why the increase? We have more things to be worried about. In 2007, the “Doomsday Clock” calculations added climate change, biotechnology and bioterrorism to the list of threats. This year, the world’s lack of response to climate change is specifically to blame for the time increase.

“Today, unchecked climate change and a nuclear arms race resulting from modernization of huge arsenals pose extraordinary and undeniable threats to the continued existence of humanity,” Kennette Benedict, executive director of the Bulletin of the Atomic Scientists, said in a statement. “And world leaders have failed to act with the speed or on the scale required to protect citizens from potential catastrophe. These failures of leadership endanger every person on Earth.”

You can check out the timeline by visiting the Bulletin website.