The following is an excerpt from the introduction of Agriculture's Energy: The Trouble with Ethanol in Brazil's Green Revolution by Thomas D. Rogers, available now wherever books are sold. From 1900 to 2000, in the midst of dramatic population growth, Brazil experienced a neat demographic inversion. At the same time that it grew by a factor of ten, from 17 million to 174 million, the country’s population moved from 85 percent rural to 85 percent urban. Now one of the most urbanized populations in the world, Brazilians have swelled cities from the far south all the...