Film director James Cameron tells CNN's Christiane Amanpour he is adapting the book, "Ghosts of Hiroshima" by Charles Pellegrino into a film that he "has to make" partly because of a pledge he made to Tsutomu Yamaguchi, a survivor of both the Hiroshima and Nagasaki bombings. #cnn #hiroshima #nagasaki #jamescameron #shorts