Everyone's got a lot of questions about climate change, so an FAQ on the subject is a great idea. McGuire's structure is also great, with a one-paragraph summary answer on each question and then a longer answer below, so it's all very accessible.
There's loads of useful information here, on how climate change is affecting the earth and what's happening now. The book is less clear on the future, and tends to focus on the worst case scenario. Bill McGuire's previous books include 'A guide to end of the world' and 'surviving armaggedon', so perhaps that's not a surprise, but it makes for some gloomy reading.
The book picks up again towards the end as it addresses solutions and practical actions, but there's still a nagging lack of optimism. At a time when people really need to be motivated and inspired, this is more likely to induce despair! Approach with caution, in other words.