According to Jeff Goodell’s article on Obama in Rolling Stone (http://www.rollingstone.com/politics/news/obama-takes-on-climate-change-the-rolling-stone-interview-20150923), President Obama did some summer reading, and here’s what he said about Elizabeth Kolbert’s book: “One of the books I read during vacation was The Sixth Extinction, by Elizabeth Kolbert. And it’s a wonderful book, and it makes very clear that big, abrupt changes can happen; they’re not outside the realm of possibility. They have happened before, they can happen again.”