Montreal writer and activist Naomi Klein sat down with Charlie Rose to discuss her brand new book This Changes Everything: Capitalism vs. the Climate, a New York Times non-fiction bestseller. The book took Klein five years to write, and she describes to Rose how and why this book in particular was the most challenging work of her career. She explains how carbon emissions are not the true source of global warming — they are just a symptom. The true cause of global warming, Klein explains, is capitalism itself. You can watch the fascinating conversation in full above, and grab your own copy of Klein’s book at ThisChangesEverything.org.