Mr. Diamond makes wonderful points, and I like his writings. I agree, he gets a little too PC, but still he makes some great points. I loved the whole analysis of the continents on an east-west axis vs. north-south axis in his Guns, Germs, and Steel.
That's one I read and liked the continental axis thing. I still don't understand his explanation why the Africans failed to domesticate any animals. It looks like the zebra would have been a great 'beast-of-burden.'