On GPS Sunday, an exclusive interview with Energy Secretary Ernest Moniz on the terms of the much-debated Iran deal. Will it make it through Congress? Then, Fareed sits down with Dr. James Hansen, a scientist who was one of the first to sound the alarm on global warming, to learn the dire conclusions of his new study. And, a look at Japan's efforts to re-militarize. Finally, is it possible to resurrect extinct creatures? Evolutionary biologist Beth Shapiro will tell us how to clone a mammoth.