Inter Press Service: If an experiment to plant sweet sorghum in rural Florida and convert it to fuel ethanol pans out, it could herald a fundamental change in how the U.S. and other countries create and use renewable bio-energy, researchers say. Biofuels, like ethanol, are widely blamed for driving food prices higher, sparking food riots in many countries. At least 25 percent of the U.S. maize crop is diverted to biofuel, and extensive areas in Indonesia, Malaysia, China and Brazil are also devoted to …