William J. Perry, who was secretary of defense under President Bill Clinton, told an audience at Stanford that "the danger of a nuclear catastrophe today is in my opinion greater than it was during the Cold War." But, he added, our policies do not reflect this new danger.
Former Secretary of State George P. Schultz said the key to reducing these tensions is " working with Russia and China, and of course, Europe."
The United States currently plans upgrades to its own nuclear arsenal. "It is very hard to reduce your reliance on nuclear weapons when you plan to spend more that $350 billion modernizing them," said Sharon Squassoni, senior fellow and director of the Proliferation Prevention Program.
While recent climate talks in Paris were an impressive achievement, they still mark only a "tentative success," said Sivan Kartha, member of the bulletin's Science and Security Board and a senior scientist at the Stockholm Environment Institute.