The authors are listed as Frederik Pohl and Isaac Asimov. Another reviewer (on Amazon.com) complained that the book's style is not Asimov's, and therefore not as entertaining as Isaac's usual writing. That is true, and it does appear that Pohl was probably the primary contributor as far as the written word is concerned. It is also true that this was Asimov's last non-fiction book, and at the time I believe he was quite ill; he died in 1992, the year following the book's publication. However, while the writing style does not seem to be Isaac's, the book is very comprehensive and detailed in its listing and explanations of the environmental dangers we face, and that detail certainly appears to be the result of Asimov's supreme intelligence, almost photographic memory, vast scientific knowledge, and wonderful research abilities. I seriously doubt that the book would contain the depth of exact detail as to what is going on as humanity continues its march onward toward the extinction of life on our planet, if Asimov had not had a hand in it. I suspect that Pohl and Asimov planned the outline of the book and the listing of the problems involved, then Pohl produced most of the wording with Asimov supplying the scientific data.
This is a very, very good book, and one which everyone who cares about the environment should read. It will fill any gaps in your knowledge of our problems, and that is a very worthwhile and even necessary thing. If you're looking for knowledge of the facts, and serious attention to the exact details involved, this book fills the bill perfectly. If you're looking for entertainment, maybe you should just forget about the dangers we face, and bury your head in some of Asimov's science fiction. I should add that while the book isn't very "amusing" in the Asimov style, it will definitely hold your interest. It isn't dull, and it never flags in its steady piling up of the facts and details involved. But not only is it not "entertaining" in an escapist way, it will just about scare you to death!
The only thing that would make this book better is for someone to put out a second edition bringing everything in the first edition up to date. The book was published in 1991 - 22 years ago (as of this date, 2013). I'm looking for something that updates it that is just as easy and captivating to read as this one is. If Pohl is still alive, maybe he could do that; but without Asimov's help, it probably wouldn't be as comprehensive and helpful, though any update would be better than nothing. And maybe some of Isaac's other friends could combine their scientific knowledge and research abilities to make up for what was lost when Asimov left us. (It might take 5 or 10 of them to replace one Asimov!)
P.S. - if anyone knows where I can find an "update" to what this book provides, I would greatly appreciate it if he or she would add their own review of this book and mention the update(s) in their review.