I enjoyed this book. In about the first two-thirds, the author presents quantitative scientific evidence indicating that the earth is warming up and that it is warmer now than ever experienced in human history. In the last third of the book, important political and economic issues are presented. Although everyone agrees that the earth is indeed warming up, some are unsure about the real human contribution to this effect; they point out that over the past hundreds of thousands of years, some sudden climate changes have occurred for unknown reasons - certainly not due to human activity; some of these sudden changes were responsible for destroying prominent cities and, indeed, civilizations. They also point out that even farther back in time, during the Cretaceous, the earth was much warmer than it is today. Hence these people suggest that it may still be too early to take drastic and expensive remedial action. On the other hand, most people appear to be convinced that humans are mainly responsible for global warming - this time around, anyway. Not willing to take the chance that they are not, these people are urging that serious measures be taken immediately to reduce greenhouse gas emissions. The book is written in a reasonably objective manner. It is clear, engaging and is difficult to put down. It is not written like an "end-of-the-world-is-near" type of book, but is filled with facts: scientific, political and economical, all backed up with a respectable list of references. I recommend this book to everyone: from those wanting to know the main issues on this important topic to those just looking for a good read.