The nuclear threat is greater today than at any time since the Cold War. In a new book, The Nation correspondent Jonathan Schell calls the time we are living in "The Seventh Decade of Nuclear Danger". Here is what he had to say on our broadcast about why he believes we need a global agreement to eliminate nuclear weapons and how close Ronald Reagan came.
Calling all HuffPost superfans!
Sign up for membership to become a founding member and help shape HuffPost's next chapter