I'm about 40% of the way through, so please don't give any spoilers in the comments (also in consideration of other readers). I was on a wait list to buy this -- a splash ad I saw a few months ago said it was the most important book of 2020. Seems it so far to me. Actually, with this and the collection of his earlier work, I think Kim Stanley Robinson should be awarded a Nobel Prize in Literature.
PS: Couldn't get new blogger to decently position a picture of the book's cover. Apparently too much to ask. Hooray for Google software updates, supposedly improving mankind one bad release at a time. (Friend of mine: "They're an advertising company, not a software company.")