That's the response from Jared Diamond who wrote a book (mentioned in the comments below: "Collapse") with pretty much the same story as yours, of course it will end with a similar conclusion.
Jared Diamond tries to make sense of history in a methodical manner referring to researches done in diverse areas spawning evolutionary biology, archaeology, ecology etc. I would expect any such serious book (though targeted towards readers not steeped in diverse fields which he refers) would appear dry.
Hm. I don't think that's going to be a problem, it might take me a while to read his work, but that's okay. That said, I'm used to such books and a world rife with war, famine, disease and horrible death.