that is my bias, while interested in books like what steven koonin has written. let's start with the title. typically you will find people have nothing better to ask you, why did you title the book "unsettled?: what climate science tells us, what it doesn't, and why it matters"? enough about me. steven koonin, why the title? it gets to what we talk about, why did you write the book? >> the -- it is a pleasure to be talking with you this afternoon. i think we will have a great conversation the title is a double and. it refers to the science itself, there are still important things about the earth's climate and human influences on it that we don't understand but also refers to my state of mind when i found out the science was not as solid as i had previously believed. >> host: the point you wrote about, you write when that happened and how it happened, the epiphany that the science wasn't as subtle as you thought occurred because you were looking into the science, not because somebody -- somebody paid you to do that, you are the under secretary of energy but nobody