I saw an interview where Alan Moore called Zubrin basically some kind of nut, probably because Newt Gingritch said something nice about him. I thought to myself, " self, if Alan Moore thinks this guy is nuts, you have got to get this book." after reading the book, I have to say Zubrin is not at all crazy, he was disappointingly sane in fact. He is certainly a glass half full guy, a bit pollyanna-ish, but sane just the same. His theories are very well thought out but thourougly optimistic. I just wish we had the stones to give some of it a try. I truly don't believe we will anytime soon and that is to our detriment. This was a pretty good read. Recommended for those who have an interest in near future space exploration.