Reddit reviews The Wild Shore: Three Californias (Three Californias (1))

I"m sorry, but I don't think your pop score is a very good way to rate books. "Number of amazon reviews * average review" is going to very heavily weight your score toward more recent releases. Even if books in the 60s or 80s were 10 times better as literature (whatever that would mean), almost no one reviews those books, so their pop score would never rise above low values.

There are several amazing works of actual literature that are not on your list. Just off the top of my head I could think of Engine Summer by John Crowley or Into the Forest by Jean Hegland or The Wild Shore by Kim Stanley Robinson. Or even The Stand, by Stephen King. Or even Cloud Atlas. While on the other hand you have books like Emergence, which are absolute crap.

I guess it's maybe true that there are a lot of post-apocalyptic books being written today, but your pop score metric seems pretty pointless to me.

The Wild Shore by Kim Stanley Robinson.

"Take a fantastic leap of the imagination and explore the world through three parallel universes - Alphaverse (what our world could end up being), Betaverse (our world today), and Gammaverse (what our world could have been)"

This premise sounds strikingly similar to Kim Stanley Robinson's Three Californias trilogy.