mr. juergen, to "after words" and thanks for doing this. first of all let me congratulate you on what is quite an achievement look at yours to qwest. i wanted to ask you, what prompted this book? you betcha coach prize-winning book, "the prize" about the history of oil. so why this, why now? especially when one of your primary conclusions is that for a while things are not really going to change much when it comes to where we get our energy. >> guest: there were a couple of reasons. one, is that while big long trends are not going to change, a lot has changed in the world, the soviet union collapsed. china hardly appeared in "the prize." it only gets two chapters in this book. right up until it happened this year with fukushima nuclear accident in the arab spring, just big impact on energy. so much happened to the other thing is i wanted to do this book is more ambitious than "the prize." because this race to cover the whole energy spectrum and see how these pieces all fit together. so there was a big topic to take on. as often happens you