Basically a book that criticises making concrete judgements on the little data we have available, and then makes some of his own, which is kind of how a lot of this works, so no surprise there. On the technical side, I found his style off-putting: it seems to suggest an intentionality and directionality to evolution that does not exist.
Overall, the basic thesis is interesting: that climate and chance drove human evolution, and determined which branches of the evolutionary tree survived. That’s accepted when it comes to other animals, but in humans we do tend to make arguments about Neanderthals being stupider than humans, etc. And yet, put me in the environment the Neanderthals thrived in, and I’d have a lot of trouble, too — and here I am with bits of paper I can show you to prove my intelligence by our standards.
I did find some things funny, like Finlayson’s self-righteous little comment about people in their comfort zones pretending to care about people in less fortunate conditions and doing nothing. He’s writing for Oxford University Press — that glass house he’s sitting in is very conspicuous.
(Probably this irritation is somewhat prompted by the fact that I am one of those people in my comfort zone. On the other hand, I tithe a portion of my income to various charities, and give up significant chunks of my free time to charity work. I don’t think Finlayson’s research does as much good for the human condition, in the grand scheme of things. For all I know he donates all the proceeds of this book to charity, but still, he also flies all over the world doing his research and spends his time writing books like this. There’s a place for that, but you’d probably best not be making disparaging comments about your likely readers while you’re sat in that place.)