Bloomberg: Bolivar Cevallos walks around the farm where his family once lived amid the oil fields of Ecuador’s Amazon rain forest. His boots sink ankle deep in tar. Everywhere he steps, oily muck seeps from the ground. A gasoline like smell hangs in the sweltering jungle air. The mess is a remnant of oil drilling in a 120-mile-long swath of the tropical jungle in northeastern Ecuador where Texaco Inc. and Ecuador’s state-run oil company, PetroEcuador, have pumped billions of barrels of crude …