{"id":71123,"date":"2025-08-03T21:30:18","date_gmt":"2025-08-03T21:30:18","guid":{"rendered":""},"modified":"2025-08-03T21:30:18","modified_gmt":"2025-08-03T21:30:18","slug":"lesprit-de-pugwash-david-bensoussan-et-samuel-s-kloda","status":"publish","type":"post","link":"https:\/\/harissa.com\/news-wp\/lesprit-de-pugwash-david-bensoussan-et-samuel-s-kloda\/","title":{"rendered":"L\u2019esprit de Pugwash &#8211; David Bensoussan et Samuel S. Kloda"},"content":{"rendered":"<p>L\u2019esprit de Pugwash &#8211; David Bensoussan et Samuel S. Kloda<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u00c0 l\u2019heure o\u00f9 la plan\u00e8te est engag\u00e9e dans un processus de r\u00e9armement massif et o\u00f9 les craintes de prolif\u00e9ration nucl\u00e9aire suscitent des inqui\u00e9tudes existentielles, il est essentiel de revenir sur l\u2019histoire des premi\u00e8res bombes atomiques largu\u00e9es sur Hiroshima et Nagasaki \u00e0 la fin de la Seconde Guerre mondiale, ainsi que sur l\u2019engagement des scientifiques pour limiter l\u2019usage de ces armes d\u00e9vastatrices.<\/p>\n<p><strong>David Bensoussan Professeur d\u2019\u00e9lectronique \u00e0 l\u2019\u00c9cole de technologie sup\u00e9rieure<br \/>\nSamuel S. Kloda Auteur de l\u2019ouvrage The Atomic Bomb in Images and Documents<\/strong><\/p>\n<p>La d\u00e9couverte de l\u2019uranium par le chimiste allemand Martin Heinrich Klaproth en 1789, suivie des travaux de Marie et Pierre Curie sur le polonium et le radium en 1898, ont ouvert la voie \u00e0 l\u2019\u00e9tude de la radioactivit\u00e9. Quatre ans plus tard, Ernest Rutherford mit en \u00e9quation le ph\u00e9nom\u00e8ne de d\u00e9sint\u00e9gration radioactive \u00e0 l\u2019Universit\u00e9 McGill, tandis que le mod\u00e8le atomique prenait forme gr\u00e2ce aux travaux de Niels Bohr, laur\u00e9at du prix Nobel en 1922.<\/p>\n<p>La d\u00e9couverte du neutron par James Chadwick en 1932 fut une perc\u00e9e d\u00e9terminante qui mena, en 1938, \u00e0 l\u2019identification de la fission nucl\u00e9aire par Otto Hahn, Fritz Strassmann et Lise Meitner. La compr\u00e9hension du m\u00e9canisme de la r\u00e9action en cha\u00eene, con\u00e7ue d\u00e8s 1933 par Leo Szilard, permit d\u2019envisager l\u2019application militaire de cette \u00e9nergie.<\/p>\n<p><strong>Le projet Manhattan et l\u2019escalade militaire<\/strong><\/p>\n<p>En 1939, Leo Szilard persuada Albert Einstein de signer une lettre adress\u00e9e au pr\u00e9sident Roosevelt, alertant sur le risque que l\u2019Allemagne nazie d\u00e9veloppe une bombe atomique.<\/p>\n<p>Ce fut le point de d\u00e9part du projet Manhattan, officiellement lanc\u00e9 en 1942 avec un budget de deux milliards de dollars, rassemblant des milliers de chercheurs, dont Enrico Fermi, Glenn Seaborg et J. Robert Oppenheimer.<\/p>\n<p>Les premi\u00e8res bombes utilis\u00e8rent deux technologies : la bombe \u00e0 uranium \u00ab Little Boy \u00bb, largu\u00e9e sur Hiroshima, et la bombe \u00e0 plutonium \u00ab Fat Man \u00bb, utilis\u00e9e \u00e0 Nagasaki.<\/p>\n<p><strong>Les d\u00e9cisions lourdes de cons\u00e9quences<\/strong><\/p>\n<p>Le 16 juillet 1945 eut lieu le premier essai nucl\u00e9aire \u00e0 Alamogordo, au Nouveau-Mexique. L&rsquo;explosion terrifiante creusa un crat\u00e8re de plus de 350 m\u00e8tres de large ; elle fut entendue \u00e0 des dizaines de kilom\u00e8tres, et il arriva que des vitres furent bris\u00e9es jusqu\u2019\u00e0 80 kilom\u00e8tres du site. \u00c0 ce moment-l\u00e0, l\u2019Allemagne avait d\u00e9j\u00e0 capitul\u00e9, mais la guerre contre le Japon se poursuivait. Face \u00e0 une r\u00e9sistance acharn\u00e9e des militaires japonais et \u00e0 la pr\u00e9diction de pertes humaines am\u00e9ricaines estim\u00e9es \u00e0 plus d\u2019un demi-million de soldats, le pr\u00e9sident Truman prit la d\u00e9cision controvers\u00e9e d\u2019utiliser la bombe atomique pour forcer une reddition rapide du Japon.<\/p>\n<p>Le bombardement d\u00e9vastateur d\u2019Hiroshima (6 ao\u00fbt) puis de Nagasaki (9 ao\u00fbt) se solda par la mort de pr\u00e8s de 230 000 personnes incin\u00e9r\u00e9es ou vaporis\u00e9es. Pr\u00e8s de 110 000 autres p\u00e9rirent des suites des radiations. Il pr\u00e9cipita la capitulation du Japon le 15 ao\u00fbt 1945.<\/p>\n<p>Depuis cette date, 2159 essais nucl\u00e9aires ont \u00e9t\u00e9 r\u00e9alis\u00e9s, qu\u2019ils soient atmosph\u00e9riques, souterrains ou sous-marins. Parmi eux figurent des bombes thermonucl\u00e9aires \u00e0 hydrog\u00e8ne bien plus puissantes ainsi que des bombes \u00e0 neutrons, dont les radiations et les effets destructeurs ciblent avant tout les organismes biologiques.<\/p>\n<p><strong>Les r\u00e9serves des scientifiques et les voix du d\u00e9sarmement<\/strong><\/p>\n<p>D\u00e8s avant les bombardements atomiques, plusieurs scientifiques avaient exprim\u00e9 leurs r\u00e9serves, craignant la propagation d\u2019une technologie aux cons\u00e9quences incalculables et demandant que l\u2019arme atomique soit largu\u00e9e dans des zones inhabit\u00e9es \u00e0 des fins de d\u00e9monstration seulement. Robert Oppenheimer, chef scientifique du projet Manhattan, avoua plus tard \u00e0 Truman son profond remords : \u00ab Monsieur le pr\u00e9sident, j\u2019ai l\u2019impression d\u2019avoir du sang sur les mains. \u00bb Albert Einstein devint un ardent d\u00e9fenseur du d\u00e9sarmement nucl\u00e9aire, publiant en 1955 le Manifeste Russell-Einstein qui appelait \u00e0 la paix et au contr\u00f4le des armes atomiques.<\/p>\n<p>Andrei Sakharov, physicien sovi\u00e9tique et p\u00e8re de la bombe H, changea lui aussi de camp dans les ann\u00e9es 1960 pour devenir un militant pacifiste et d\u00e9fenseur des droits de la personne, d\u00e9non\u00e7ant les dangers nucl\u00e9aires.<\/p>\n<p><strong>Le mouvement Pugwash : science et conscience<\/strong><\/p>\n<p>N\u00e9 en 1957 \u00e0 l\u2019initiative de J\u00f3zef Rotblat et Bertrand Russell, le mouvement Pugwash a \u00e9volu\u00e9 dans le contexte tendu de la guerre froide. S\u2019appuyant sur le Manifeste Russell-Einstein, il r\u00e9unit intellectuels, scientifiques et diplomates soucieux de pr\u00e9venir la guerre nucl\u00e9aire et de promouvoir la responsabilit\u00e9 \u00e9thique face aux avanc\u00e9es scientifiques.<\/p>\n<p>\u00c0 travers des rencontres informelles entre experts des deux blocs, Pugwash favorisa un dialogue apaisant et influen\u00e7a la cr\u00e9ation de trait\u00e9s de d\u00e9sarmement majeurs, notamment le Trait\u00e9 de non-prolif\u00e9ration nucl\u00e9aire (TNP) et le Trait\u00e9 d\u2019interdiction partielle des essais nucl\u00e9aires. En 1995, le mouvement re\u00e7ut le prix Nobel de la paix, saluant son r\u00f4le discret mais d\u00e9terminant dans la promotion de la paix mondiale.<\/p>\n<p><strong>Un esprit toujours d\u2019actualit\u00e9<\/strong><\/p>\n<p>L\u2019utopie messianique de paix universelle semble aujourd\u2019hui plus \u00e9loign\u00e9e que jamais. Il n\u2019en demeure pas moins que face aux menaces contemporaines \u2013 armes nucl\u00e9aires renouvel\u00e9es, r\u00e9armement intense, cyberattaques, pand\u00e9mies et changement climatique \u2013, l\u2019esprit de Pugwash demeure une r\u00e9f\u00e9rence majeure. Il rappelle que la science, d\u00e9connect\u00e9e de l\u2019\u00e9thique, peut devenir un pouvoir aveugle. La responsabilit\u00e9 des scientifiques d\u00e9passe les laboratoires : elle s\u2019inscrit dans une d\u00e9marche globale de la paix et de la survie de l\u2019humanit\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019esprit de Pugwash &#8211; David Bensoussan et Samuel S. Kloda &nbsp; &nbsp; \u00c0 l\u2019heure o\u00f9 la plan\u00e8te est engag\u00e9e dans un processus de r\u00e9armement massif et o\u00f9 les craintes de prolif\u00e9ration nucl\u00e9aire suscitent des inqui\u00e9tudes existentielles, il est essentiel de revenir sur l\u2019histoire des premi\u00e8res bombes atomiques largu\u00e9es sur Hiroshima et Nagasaki \u00e0 la fin&hellip;&nbsp;<\/p>\n","protected":false},"author":1,"featured_media":71124,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-71123","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>L\u2019esprit de Pugwash - David Bensoussan et Samuel S. 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