I haven’t read all (or even most) of it yet, but I feel obliged to direct you to a special edition of American Prospect on the subject of a post-petroleum economy. Much of it is behind a subscription wall (go ahead, subscribe), but David Morris’ piece on the carbohydrate economy is free to read, and a mind-blower. At least it blew my mind a little. I’m still processing it — may post something later.