Rank #19 ITN Score: 21/30

Nuclear Weapons & Disarmament

The world's ~12,500 nuclear warheads pose an existential threat to civilization. A large exchange between major powers could trigger nuclear winter, kill hundreds of millions directly, and collapse global food systems for years.

Key Statistic

A regional nuclear war between India and Pakistan could kill 100 million people within weeks and cause a global famine affecting 2 billion.

ITN Assessment

Importance10/10

Scale & severity

Tractability5/10

Ease of progress

Neglectedness6/10

Lack of attention

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Why This Matters

Existential risk potential; low tractability for full disarmament but moderate for risk reduction; some neglected pathways around AI-nuclear interaction, cyber vulnerabilities, and command modernization.

Key Organizations

Ploughshares Fund
Primary philanthropic funder of nuclear security research and advocacy.
Arms Control Association
Research and advocacy on nuclear arms control and disarmament.
Bulletin of the Atomic Scientists
Maintains the Doomsday Clock; policy research on nuclear and other global risks.
Carnegie Endowment for International Peace (Nuclear)
Policy research on nuclear security and arms control diplomacy.
Federation of American Scientists
Technical and policy research on nuclear arsenals and security.

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The Nuclear Threat in the 21st Century: Risks, Pathways, and Reduction Strategiesv1Accepted

WorldProblems Solved

The world's approximately 12,500 nuclear warheads represent the most concentrated source of civilizational risk under human control. While the Cold War's peak danger has receded, new pathways to nuclear catastrophe have emerged: AI-accelerated decision-making, cyber vulnerabilities in command and control, proliferation risks, and the renewed military competition among nuclear-armed states. This founding report surveys the contemporary nuclear threat landscape and makes the case for nuclear risk reduction as a neglected high-priority cause.

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80,000 Hours Problem Profile

https://80000hours.org/problem-profiles/

Problem Profile

Why Pressing

The world's approximately 12,500 nuclear warheads pose a civilizational risk with no close analogue. A large-scale exchange between the US and Russia could kill hundreds of millions directly and trigger nuclear winter — a collapse in global agriculture sufficient to cause famine at civilizational scale. New risk pathways have emerged since the Cold War: AI integration into military decision systems compresses decision timelines from hours to minutes; cyber vulnerabilities in command-and-control infrastructure create new pathways to accidental launch; the collapse of New START in 2026 left the world's two largest arsenals unconstrained for the first time in 50 years. The field has genuine tractability via arms control, de-alerting, and hotline diplomacy — but is chronically understaffed and underresourced relative to the stakes.

Scale

Nine states possess nuclear weapons, with the US and Russia holding 88% of the global total. A full exchange between these two countries would kill an estimated 100–300 million people directly, and nuclear winter models project a multi-year agricultural collapse that could threaten the survival of billions more. Toby Ord estimates a 0.1% per year probability of nuclear war causing existential catastrophe — compounding to approximately 10% over a century. A regional nuclear exchange between India and Pakistan — both increasing their arsenals — could kill 100 million within weeks and produce global famine affecting 2 billion.

Neglectedness

Nuclear security philanthropy is approximately $1.5 billion per year globally — less than the cost of one aircraft carrier. Organizations like the Ploughshares Fund, Arms Control Association, and Carnegie Endowment work with small teams relative to the scale of the risk. The intersection of AI and nuclear security — arguably the most urgent emerging sub-problem — has under $50 million in dedicated research funding globally. The technical workforce at the AI-nuclear intersection is estimated at fewer than 100 researchers worldwide.

Tractability

Nuclear risk has historically been tractable via diplomacy and arms control. The SALT, INF, and START treaties verifiably reduced arsenals by thousands of warheads. De-alerting proposals — extending decision time from minutes to days for 2,000 warheads on hair-trigger alert — are technically straightforward and have precedents. No-first-use pledges, hotline modernization, and cyber-nuclear security agreements are achievable with sustained diplomatic pressure. AI-nuclear governance frameworks are an emerging area with a narrow window for international norm-setting.