The wait is over. Rachel Laudan’s talk at Postopolis is now available in two versions. Rachel herself carries a transcript of her talk, with some photos. And Nicola over at Edible Geography has the same transcript with different photos and a bit more by way of introduction. ((And according to Nicola videos are in the offing too.))
There is so much content there that I hardly know what to say, except that I am in awe of the research skills and basic understanding of the problem. The basic point is that “without food energy, a city is nothing”. For most people and most of history, that energy came from grains: about a kilo per person per day. And the consequences of that … go read!