mr. yergin, to "after words" and thanks for doing this. first of all, let me congratulate you on what is quite an achievement, this book of yours, "the quest." the first thing i wanted to ask you is what prompted this book. obviously you had your pulitzer prize-winning book, "the prize," about the history of oil. so why is this, why now, especially when one of your primary conclusions is that for a while things aren't really going to change much when it comes to energy. >> guest: i think there is a couple of reasons. one come is while the trends aren't going to change a lot has changed in the world. the soviet union collapsed, china was hardly toward the prize. the only country that gets two chapters in the book right up to what happened this year with the fukushima nuclear accident and the arabs bring. so much happened and the other thing is what i wanted to do it this is more ambitious in the price that's what i thought when i was writing it because this tries to cover the whole energy spectrum and see how the pieces fit together. so, th

mr. yergin to "after words" and thanks for doing this. first of all let me congratulate you on what is quite an achievement, this book of yours, "the quest." the first thing i wanted to ask you, i wanted to ask you what prompted this book? obviously you had your pulitzer prize-winning book, the price about the history of oil. so, why this, why now, especially when one of your binary conclusions is that for a while, things aren't really going to change much when it comes to where we get our energy from. >> guest: a couple of reasons. one is that long-term trends are going to change. a lot has changed in the world. the soviet union collapsed. china is the only country that gets two chapters in this book. right up until what happened this year with fukushima nuclear accident and the arab spring. both of them with bing impact on energy. the other thing what i wanted to do, this is more ambitious and the prize, ambitious as i thought that was when i was writing it because this tries to cover the whole energy spectrum and see how these pieces a