It is sort of an academic summary of efforts aiming to address sustainability, identifying friends and foes, trends and needs.
Rather dry, matter-of-fact with some opinions stated here and there, it falls somewhere between a beginner's handbook and a scientific report, however is neither.
It could be a good place to start reading about sustainability, however if you're already well informed of the matter the book probably does not provide a lot of interesting information.
I find the section about why there is so much resistance to sustainability policies particularly interesting as this is not often discussed in public, so 4-star for that part.