Farmers Sense the End of Big Boom - Record Crop Prices Have Driven Up Incomes, but Rising Costs and Cooling Demand Are Starting to Take a Bigger Bite [WSJ]7 Billion: Understanding the Demographic Transition - by Sharon Astyk [Casaubon's Book]Seven Billion by Joel Cohen [NYTs]How Do You Get to 7 Billion People? (Includes good graphic) [WSJ]Growing an acre of corn, soybeans or wheat in 2012 will