Lead: The Bulletin of the Atomic Scientists moved the Doomsday Clock to 85 seconds to midnight on Tuesday, the closest setting in the clock’s history. The decision, announced by the Bulletin’s leadership, cites rising nuclear tensions, accelerating climate impacts, growing biological risks and unregulated advances in artificial intelligence. The change follows last year’s setting of 89 seconds and a pair of 90-second settings in 2023 and 2024, signaling the board’s view that progress on existential threats remains insufficient.
Key Takeaways
- The Doomsday Clock was set at 85 seconds to midnight in 2026 by the Bulletin of the Atomic Scientists, its nearest point to midnight since 1947.
- Bulletin leaders cited intensified conflicts in 2025, including military operations involving nuclear-armed states and the imminent expiration of a U.S.–Russia arms treaty on February 4, 2026.
- Climate change, biological risks (including concerns about synthetic biology) and disruptive technologies such as AI were named as compound drivers of increased existential risk.
- The Bulletin previously set the clock at 90 seconds in 2023 and 2024 and moved it to 89 seconds in 2025 before this year’s 85-second setting.
- The clock is a symbolic measure intended to spur public and political discussion, not a predictive instrument with a precise metric for catastrophe.
- Historical context: the clock moved farthest from midnight in 1991 (17 minutes) after the Strategic Arms Reduction Treaty.
Background
The Doomsday Clock was created in the aftermath of World War II by scientists associated with the Manhattan Project and formally introduced by the Bulletin of the Atomic Scientists in 1947. The Bulletin itself was formed as a nonprofit in 1945 to track and communicate risks created by human technology, initially focusing on nuclear weapons and later expanding criteria to include climate change in 2007. Each year, the Bulletin’s science and security board, in consultation with a board of sponsors that historically has included prominent scientists and Nobel laureates, decides whether to adjust the clock.
Over its nearly eight-decade history, the clock has been both a public signal and a rhetorical tool: it is designed to provoke debate about policy choices rather than to function as a scientific forecast. Moves away from midnight have correlated with diplomatic arms agreements, while moves toward midnight have tracked escalations in geopolitics, scientific developments and failures of global governance. The Bulletin has said repeatedly that because humans create these threats, humans can reduce them — but doing so requires coordinated policy and societal engagement.
Main Event
The Bulletin announced the new 85-second setting during a public briefing in which its leaders cited a series of developments they see as worsening global risk. Bulletin President and CEO Alexandra Bell emphasized that nuclear danger, climate impacts and disruptive technologies are all intensifying and that progress to address those threats has been inadequate. The scientists pointed specifically to heightened adversarial behavior among major powers in 2025 and multiple military operations that involved nuclear-armed states as evidence of rising nuclear risk.
Dr. Daniel Holz, chair of the Bulletin’s science and security board and a physics professor at the University of Chicago, warned that the last remaining treaty constraining U.S. and Russian nuclear stockpiles is due to expire on February 4, 2026, a development he said could remove a major constraint on an arms race. The Bulletin also flagged life‑science advances — including work described as the development of synthetic mirror life — as an area of growing concern, and said international coordination to manage such risks remains lacking.
The group identified rapid growth and deployment of AI tools, coupled with limited regulation, as amplifiers of mis- and disinformation that in turn weaken democratic processes and collective responses to other crises. The Bulletin framed the clock as a communicative device: its purpose is to draw attention to the scale and urgency of these intersecting threats and to push for policy change at national and international levels.
Analysis & Implications
The 85-second setting conveys the Bulletin’s assessment that multiple risk domains are converging and that governance systems are not keeping pace. A central implication is political: treaty expiry and rising geopolitical rivalry reduce the diplomatic space for arms-control diplomacy, increasing the chance of unrestrained nuclear modernization by major powers. Economically, heightened geopolitical risk can depress investment in cross-border climate and global health initiatives and raise defense expenditures, which shifts public resources away from mitigation and adaptation efforts.
On climate, the Bulletin’s assessment reflects both intensifying physical impacts and insufficient policy response. Even with national targets and pledges, greenhouse gas emissions pathways remain inconsistent with limiting warming to internationally agreed thresholds, which raises the likelihood of cascading effects on food, water and infrastructure that could amplify other security risks.
Biological risks and advanced life-science research add another layer: breakthroughs that lower technical barriers to manipulating organisms can create avenues for accidental or deliberate harm if governance and biosafety oversight do not keep pace. The Bulletin’s emphasis on these risks signals urgency for international standards, funding for surveillance and robust biosafety measures in both public and private laboratories.
Finally, unregulated AI multiplies the speed and scale at which misinformation can spread, eroding public trust in institutions and scientific facts. That erosion complicates public health responses, climate policy implementation and arms control diplomacy because shared facts are a precondition for cooperative action, the Bulletin argues.
Comparison & Data
| Year | Time to Midnight |
|---|---|
| 1991 | 17 minutes |
| 2023 | 90 seconds |
| 2024 | 90 seconds |
| 2025 | 89 seconds |
| 2026 | 85 seconds |
The table highlights how the clock has tightened in recent years: after two years at 90 seconds and a modest move to 89 seconds in 2025, the Bulletin has set 2026 at 85 seconds. By contrast, 1991 represents the farthest point from midnight (17 minutes) when arms-control diplomacy led to tangible reductions in nuclear arsenals. The comparison underscores the Bulletin’s core message: diplomatic action and policy choices can and have shifted global risk in meaningful ways.
Reactions & Quotes
The Bulletin’s announcement prompted immediate reactions from scientists, analysts and media commentators. Bulletin leaders framed the decision as a sober call for urgent action across diplomacy, science governance and public engagement.
“Humanity has not made sufficient progress on the existential risks that endanger us all.”
Alexandra Bell, Bulletin President and CEO
The Bulletin chair provided context about geopolitical and scientific trends driving the change, stressing treaty timelines and life‑science concerns.
“Conflicts intensified in 2025 with multiple military operations involving nuclear-armed states.”
Dr. Daniel Holz, Bulletin science and security board chair
Voices in civil society and journalism emphasized the role of facts and public discourse in enabling collective action against the risks the Bulletin highlights.
“Without facts, you can’t have truth. Without truth, you can’t have trust.”
Maria Ressa, journalist and CEO of Rappler
Unconfirmed
- Whether the expiration of the U.S.–Russia treaty on February 4, 2026, will immediately trigger an unchecked arms race remains uncertain and depends on diplomatic moves after that date.
- Specific claims about the global extent and maturity of ‘‘synthetic mirror life’’ projects vary by source; independent, comprehensive inventories of such work are limited.
- The exact quantitative impact of AI on the acceleration of other risks (nuclear decision cycles, biological misuse, disinformation spread) is debated and not yet established with consensus figures.
Bottom Line
The Bulletin’s decision to set the clock at 85 seconds to midnight is a deliberate signal that multiple, interacting threats are moving faster than governance systems designed to manage them. It is not a scientific forecast of a specific event but a call to policymakers, scientists and the public to increase cooperation and to enact measurable safeguards in nuclear policy, climate action, biosafety and AI governance.
History shows the clock can move away from midnight when effective diplomacy and policy responses are implemented; the 1991 shift after arms-reduction treaties is a clear example. The Bulletin’s 2026 setting therefore functions as both a warning and an implicit roadmap: reducing existential risk will require concerted international agreements, strengthened scientific norms and sustained public engagement.
Sources
- CNN (media) — coverage of the Bulletin’s 2026 announcement and recorded remarks from Bulletin officials.
- Bulletin of the Atomic Scientists (official) — the organization that maintains the Doomsday Clock and publishes rationale for each setting.
- Union of Concerned Scientists (NGO/analysis) — expert commentary on global security and the interplay between climate, technology and policy.