I think some of this book's reviews are entirely unfair. They are correct in what they are saying: this book is subjective, and slightly misleading. But, it is not a text book, it is a good read! I imagine most people who would choose to read this book would always view another individuals opinions cautiously and seek to research the information further.
I really enjoyed the book, I just suggest you read the book in a manor the title suggests (light-hearted). The issues throughout are important and for those who simply view this as waffle and would rather read a text book. I personally suggest the most up to date IPCC report...