Nuclear war
Imagine a room awash in gasoline, and there are two implacable enemies in that room. One of them has nine thousand matches. The other has seven thousand matches. … What is necessary is to reduce the matches and to clean up the gasoline.
A widely shared shorter version (“two sworn enemies standing waist deep in gasoline, one with three matches, the other with five”) is a later paraphrase, not Sagan’s words.
- About 12,200 warheads in nine states. The United States, Russia, the United Kingdom, France, China, India, Pakistan, North Korea and Israel together held an estimated 12,187 nuclear weapons in January 2026. Of these, 9,745 were in military stockpiles and about 4,012 were deployed with operational forces (SIPRI Yearbook 2026, data for January 2026 (opens in a new tab)).
- Two arsenals dominate, and stockpiles may soon grow. The United States and Russia hold almost 86% of all warheads. The world total is still falling only because both are dismantling retired warheads. SIPRI expects new warheads entering stockpiles to outpace dismantlement soon, and estimates that China’s arsenal grew from 600 to up to 620 warheads during 2025 (SIPRI Yearbook 2026 (opens in a new tab)).
- Arms control has eroded. SIPRI reports that the strategic nuclear arms control framework has collapsed and the non-proliferation regime is under stress, while nuclear-armed states have become more secretive about their arsenals (SIPRI Yearbook 2026 summary (opens in a new tab), 2026).
- More wars between states. Armed conflict took place in 49 states in 2025. The number of interstate conflicts doubled from three in 2024 to six in 2025, and four of the six involved a nuclear-armed state, including the fighting between India and Pakistan in May 2025 (SIPRI Yearbook 2026 summary (opens in a new tab), data for 2025).
- Record military spending. World military expenditure rose for the 11th year in a row, to US$2,887 billion in 2025, or 2.5% of world GDP. This is the highest level SIPRI has recorded (SIPRI Yearbook 2026 summary (opens in a new tab), data for 2025).
Talk: I’ve studied nuclear war for 35 years -- you should be worried | Brian Toon | TEDxMileHigh (opens in a new tab) (November 2017)
If you live in a city that has a military base, there’s a missile that’s aimed at you right now. If you live in a city that has an important industry, a major university, a large airport, an oil refinery or oil storage facilities, there’s a hydrogen bomb that’s aimed at you right now. We live in a perilous era.
There are 15,000 nuclear weapons on the planet. And the 9 nuclear weapon states are in conflict with each other. The United States and North Korea, NATO and Russia, India and Pakistan. We’re just one misunderstanding, one mistake, or one fanatic politician away from a nuclear conflict. In World War II, fleets of hundreds or even a thousand airplanes were used to bomb a single city. But with the invention of the atomic bomb, only one airplane and one bomb was needed.
Current figure: The figure of 15,000 is as stated in the talk (November 2017). SIPRI estimates that nine states held about 12,187 nuclear weapons in January 2026 (SIPRI Yearbook 2026 (opens in a new tab)).
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Share of world nuclear warhead inventory (Jan 2026)
Countries
- Russia44.5%
- United States41.4%
- China5.1%
- France3.0%
Continents
- Europe49.4%
- North America41.4%
- Asia9.3%
Total inventory (deployed, stored and retired warheads awaiting dismantlement), January 2026. All figures are SIPRI estimates. Top 5 countries and top 3 continents with at least 3% of the world total. Source: SIPRI Yearbook 2026 (opens in a new tab).
Share of world military expenditure (2025)
Countries
- United States33.1%
- China11.6%
- Russia6.6%
- Germany3.9%
- India3.2%
Continents
- North America34.9%
- Europe29.6%
- Asia29.1%
2025, current US dollars. Shares are of SIPRI’s world total (US$2,887 billion), which includes estimates for countries without data; continent totals add up countries with data only. Top 5 countries and top 3 continents with at least 3% of the world total. Source: SIPRI Military Expenditure Database (opens in a new tab).