"So among the things we need to know about ourselves is that the Upper Palaeolithic period, which may well have begun in genocide, ended with an all-you-can-kill wildlife barbecue. The perfection of hunting spelled the end of hunting as a way of life. Easy meat meant more babies. More babies meant more hunters. More hunters, sooner or later, meant less game. Most of the great human migrations across the world at this time must have been driven by want, as we bankrupted the land with our moveable feasts."