From the end notes, I think the author's response would be that the carbon equivalent emissions come from the fossil fuel used in growing, fertilizing, harvesti

From the end notes, I think the author's response would be that the carbon equivalent emissions come from the fossil fuel used in growing, fertilizing, harvesting, transporting, refrigerating, packaging, and so-on. The larger point of the book is that specific accounting is messy, but if we proceed anyway we can get to the rough orders of magnitude that are more useful.