Colloquium Abstract With geopolitical and technological changes driven by the nine nuclear weapons states, we are witnessing a new nuclear arms race and deterioration of the multi-decade arms control regime. This talk will overview basic information on nuclear arms, the current  critical situation, feasible steps to reduce the nuclear threat, and a new project initiated by […]

Colloquium Abstract A nuclear war could inject so much smoke from the resulting fires into the stratosphere that the resulting climate change would be unprecedented in recorded human history. Our climate model simulations find that the smoke would absorb sunlight, making it dark, cold, and dry at Earth’s surface and produce global-scale ozone depletion, with enhanced […]

Colloquium Abstract With the end of the Cold War, the public, activists and our government thought the danger from nuclear weapons was on a glide path to zero and those concerned about existential threats turned to other issues, notably global warming. Unfortunately, we were wrong.  Russia has made nuclear threats to keep NATO from intervening against […]

Colloquium Abstract  Eighty years ago, physicists first worked out what it would take to build a simple nuclear weapon and the immediate effects of its use. Five years later, theory and experiment became devastating facts as the United States built, tested, and then used the first nuclear weapons to destroy cities. Today, there are nine […]