I am learning that a book that is described by many reviewers as “ambitious” may not be the right book for me. I really liked this book generally, but felt confused by the ending somewhat and felt the author had a Big Idea that may or may not have really worked out. Sometimes I have to get all the way to the end of these “climate disaster” books to tell if it’s a story of hope or a story of doom, and gosh I’m still not sure about this one. A great read told in a before, during, after way. A little scifi, a little fantasy.