It's been awhile since I read this book, but seeing it pop up on my Goodreads, I wanted to warn other people away from wasting their time with this one. I borrowed this as an audiobook from our library, and there wasn't a whole lot of substance here other than the author's strange obsession with using agricultural waste to feed incinerators for electrical power. For a book purporting to have a "green" bent, ignoring the human health implications of incinerators and the much cheaper solution of composting makes me think the author is more interested in techno-solutionism than actual best practices.

If you're actually interested in vertical farming, your time would be better spent listening to select episodes of the Farm to Taber. I'm sure there's a good book on the subject out there, but this isn't it.