Basically, it argues that climate change is, long-term, essentially an insolvable problem. The proposals being advocated today -- take less car trips, car pooling, mass transit, making your home energy efficient (if you can) -- are far, far too little, and far too late.
The drastic and overwhelming changes we need to address the global warming problem as so enormous that we cannot afford to delude ourselves into thinking that a few small lifestyle changes will solve the problem. They won't. We literally need to completely remake our lives -- and that has never happened in the history of mankind, and there's absolutely no evidence that it will happen today, or anytime in the future.
It's not a pleasant situation, and I don't know the answer. Geoengineering is probably the best answer, with all its uncertainities and unintended consequences. The long-term physics are simply against us. We should have have listened to scientists like Wallace Broeckner three decades ago. We did not. We can't even get it together today, and there's no evidence we will get it together tomorrow.