The Bulletin of the Atomic Scientists, an organisation founded by Albert Einstein and Robert Oppenheimer, made the declaration during their 75th annual reading of the metaphorical countdown to armageddon.
"The members of the Science and Security Board find the world to be no safer than it was last year at this time and therefore decide to set the Doomsday Clock once again at 100 seconds to midnight", the group said in a statement on Thursday.
"This decision does not, by any means, suggest that the international security situation has stabilised. On the contrary, the Clock remains the closest it has ever been to [a] civilisation-ending apocalypse".
In terms of mitigating steps, the organisation called on the US and Russian presidents to identify more ambitious limits on nuclear weapons and delivery systems by the end of this year. China, the release added, should commit to a no-first-use of nuclear weapons policy along with the United States and Russia.
In addition, Iran and the United States should rejoin the nuclear deal and North Korea should codify its ban on nuclear and long-range missile tests, the release said.
The group said the time is based on continuing threats posed by nuclear weapons, climate change, disruptive technologies, and COVID-19. They also said an environment of corrupt information that undermines rational decision making on these issues has exacerbated the threats.
The Doomsday Clock has been set at 100 seconds to midnight for the last two years, the release noted.