After World War II, many nuclear weapons were built as a “deterrent,” but their use would devastate the planet. Physicist Joseph Rotblat left the Manhattan Project and argued that scientists had a moral duty to curb these arms. In 1957 he co-founded, with Bertrand Russell and others, the Pugwash Conferences, which gave scientists an informal space for dialogue even during the Cold War. Such talks helped pave the way for the Partial Test Ban Treaty and pushed the political role of nuclear weapons downward.

The central idea behind Rotblat and the Pugwash movement is to bridge scientific knowledge and policy while engaging civil society to minimise nuclear risk. At Pugwash meetings, experts in physics, law, and political science attend in their personal capacity and present consensual statements to governments and the UN. The small, off-the-record format acts as Track 1.5 diplomacy, allowing compromise proposals that formal talks cannot easily produce. The network helped broker the Hotline Agreement after the Cuban crisis, the ABM Treaty, and the Chemical Weapons Convention, thereby nurturing a long-term trend that reduces the place of nuclear weapons in international politics.

The Pugwash Conferences function as a laboratory for evidence-based policy designed to curb the military misuse of science. Annual meetings and workshops employ Delphi-style debates on NFU doctrines, strengthened IAEA safeguards via the Additional Protocol, and other themes, with chair’s memoranda circulating among national delegations. Rotblat supplied quantitative radiobiological risk assessments, integrating the LNT model into policy benchmarks. Participants evaluated seismic verification and radio-xenon detection, feeding technical advice into the CTBT’s International Monitoring System. These cumulative outputs convinced the Nobel Committee that the laureates had effectively diminished the political salience of nuclear arms and pointed toward their ultimate abolition.