Doomsday clock extremes
2020 100 seconds
Continued fears of nuclear risks and climate change crisis continues to grow.
2019 2 minutes
Lack of progress on nuclear risks and the dangers of climate change.
1991 17 minutes
The Cold War ends. U.S. and Russia reduce nuclear arsenals.
1953 2 minutes
The U.S. tests its first hydrogen bomb in November 1952.